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gthumb used to be my preferred way to browse a directory of photos. Now, when I try to view a picture fullsize by double clicking it, it just shows me the thumbnail. Even clicking 'fullscreen' just shows the thumbnail.
It looks like that there is an issue updating from 2.12.x to 2.14.x: the settings seem to be wrongly imported/migrated so that all extensions are disabled by default. There is already an upstream bug: https://bugzilla.gnome.org/show_bug.cgi?id=666302 Although I have seen the same issue I can't reproduce it. To help to debug the issue, please can you retrieve all your gthumb settings via gconftool-2 -R /apps/gthumb and attach them to this bug report. To re-enable your extensions, just use the config dialog in gthumb: Edit -> Preferences -> Extensions and re-enable the ones you need. If the pictures are still not shown full-screen, you can check Edit -> Preferences -> Viewer -> After loading an image This should be set to "Fit to Window" for fullscreen display.
the key was that no extensions were enabled. (In previous releases that wasn't necessary for 'basic viewing'. When I turned that on, it behaves as expected.