I had steam installed so had both gdk-pixbuf2.i686 and gdk-pixbuf2.x84_64.  Both were at version 2.44.4-1.

After the update both were upgraded to version 2.44.6 and when gkrellm tries to start I get this.

--------------------
$ gkrellm
Gtk-Message: 06:34:01.590: Failed to load module "pk-gtk-module"

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: frame_top

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: frame_bottom

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: frame_left

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: frame_right

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: bg_chart

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: bg_grid

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: bg_panel

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: bg_meter

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: decal_alarm

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: decal_warn

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: decal_misc

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: decal_button

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: krell_panel

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: krell_meter

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: krell_mail

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: krell_slider

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: krell_mini

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.029: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)

(gkrellm:22959): GdkPixbuf-WARNING **: 06:34:02.030: Error loading XPM image loader: Image type “legacy-xpm” is not supported
  Cannot load xpm: (null)
gkrellm segmentation fault:    (?)
Aborted                    (core dumped) gkrellm
--------------------------

I was able to downgrade gdk-pixbuf2,x86_64 to version 2.44.4, but for some reason gdk-pixbuf2.i686 version 2.44.4 is not in the updates-archive repo so cannot be downgraded to the original version (2.44.4) that was installed before this upgrade. It attempts to install gdk-pixbuf2-2.44.3-1.i686 and there is a conflict with files from gdk-pixbuf2-2.44.4-1.x86_64.

The only solution I found was to remove gdk-pixbuf2.i686 WHICH ALSO FORCES A REMOVAL OF STEAM AND SEVERAL OTHER i686 PACKAGES.

When I attempt to reinstall steam it forces an upgrade of gdk-pixbuf2.x86_64 back to the 2.44.6 version which appears to be the original cause of this problem noted above.

I note there are at least 2 other bugs related to gdk-pixbuf2,
https://bugzilla.redhat.com/show_bug.cgi?id=2452248
and
https://bugzilla.redhat.com/show_bug.cgi?id=2460118

Reproducible: Always

Steps to Reproduce:
1.perform dnf upgrade (which upgrades gdk-pixbuf2 to version 2.44.6)
2.attempt to start gkrellm (with the result shown above)

Actual Results:
The results shown above with gkrellm aborted with a core dump.

Expected Results:
gkrellm should start with no problems.

Additional Information:
1. recovery by downgrade gdk-pixbuf2.x86_64 to version 2.44.4 and gkrellm will start.
HOWEVER
This forces a removal of gdk-pixbuf2.i686 since that package is not in the updates-archive repo and only version 2.44.3 is in the fedora repo. That also forces a removal of steam and other related i686 packages.

The final fix I found was to downgrade both gdk-pixbuf2.i686 and gdk-pixbuf2.x86_64 to version 2.44.3 from the fedora repo then reinstall steam with the command 
`sudo dnf install steam --exclude gdk-pixbuf2\*`