Description of problem:

After recent updates an attempt to pick up "Help" for any applet on a panel
ends up with the following alert:

Could not process document

The document '///usr/share/gnome/help/clock/C/clock.xml' could not
be processed.  The file '/usr/share/yelp/xslt/db2html.xsl' is either
missing, or is not a valid XSLT stylesheet.

AFAICS /usr/share/yelp/xslt/db2html.xsl does exist and

   rpm -qVf /usr/share/yelp/xslt/db2html.xsl

does not result in any complaints so it does not seem to be corrupted.

Actually in a yelp window which opens, and after that alert is dismissed,
trying to pick up any document, as opposed to a navigation link, results
in the same alert and help does not open.

This happens at least on x86_64 installation where I tried this.

Version-Release number of selected component (if applicable):
yelp-2.13.2-2

How reproducible:
always