Description of problem:
After reviewing updates to be installed, I decided to install Epiphany first instead. I searched for Epiphany then clicked the Install button while viewing the list of search results. The install button did not become insensitive and the label did not change to Installing as I would have expected. I chose not to click Install again, though I could have. Instead, I clicked on Epiphany's row to visit its details page. Here, the install button was correctly insensitive, the label read Installing, and a spinner was running. I clicked the back button in the header bar and Software crashed.

Version-Release number of selected component:
gnome-software-3.13.91-1.fc21

Additional info:
reporter:       libreport-2.2.3
backtrace_rating: 4
cmdline:        /usr/bin/gnome-software --gapplication-service
crash_function: gtk_widget_class_init
executable:     /usr/bin/gnome-software
kernel:         3.16.1-301.fc21.x86_64
runlevel:       N 5
type:           CCpp
uid:            1000

Truncated backtrace:
Thread no. 1 (2 frames)
 #0 gtk_widget_class_init at /lib64/libgtk-3.so.0
 #1 g_hash_table_lookup at /lib64/libglib-2.0.so.0