I suspect that you have the only publicly released version of the Gallery v 3.01.12 which was available as part of the old DNN forums module. If this is the case, I would be very surprised if it would successfully install and be usable in DNN 5.0 as it had many issues making it generally unusable in DNN 4.x. I am surprised, however, that you did not receive any error message when adding the module to a page - did you check the Admin --> Event Viewer to see if any errors were logged? BTW, was this an upgrade of a DNN 4.x site which already had the Gallery module installed to DNN 5.0?

If you have Host permission on the site you should be able to determine the installed module version by inspecting its definition at Host --> Module Definitions. If not and you can examine the site's files, you should find reference to the version in the file DesktopModules\Gallery\Documentation\Contributors.txt. If this were not a DNN 5.0 site, you could also look at the Gallery.dnn.config manifest file to obtain the version.

At any rate, a new version of the Gallery 4.03.00 is now passing through the Release Tracker testing and if all goes well should be available within the next few weeks (mid-January??). In addition to fixing literally hundreds of bugs and adding several enhancements, the new version has received some testing in DNN 5.0 RC2 and appears to work well.  The new version will require DNN 4.9.0 as its minimum framework.

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner

and yes, this was already installed on 4.x and someone (the host I presume) upgraded us to 5.0 - this is when the issue started. tx.