First I would verify in the Admin --> File Manager that all of the Gallery folders have their View permission set for "All Users" and not "Administrators" or "Registered Users". If you let Gallery set up its default folder structure, there will be a Gallery folder in the portal's root folder and beneath that one or more folders whose names are the number of the ModuleID for each Gallery module. Each numbered folder (and of its child folders) should show "All Users" (green check not red X) in the "View" permissions column.

Did you upload the image files using the Gallery upload user interface or via FTP directly into the Gallery folders? If the latter, have you performed a file synchronization on the Gallery folders in File Manager?

The Slide Show component uses a different method of accessing the image files and as I recall does not perform the same permission check that simply clicking on a thumbnail does - hence the reason why the Slide Show is working.

If resetting the permissions does not take care of the problem, perhaps you can grant me temporary admin permission on the site and I'll see if I can help you further. My email address is bill AT wesnetdesigns DOT com if you would like to go that route.

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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

Mike,

I'm afraid I'm running out of ideas as I've never seen that behavior before. In Fiddler I can see that there is a 302 redirection to the login control as soon as the Gallery module attempts to load DesktopModules/Gallery/GalleryPage.aspx which is a wrapper around various views when pop-ups are enabled in the Gallery configuration. GalleryPage does check for a number of potential security violations and if any are found there will be an intentional redirection to the DotNetNuke access denied url which will by default bring up the login control. Here are the checks - perhaps one of they might bring to mind something that is different about your site:

1. The tabid value (90) contained in the GalleryPage.aspx querystring must be the same as the currently active page. It looks to be correct and it does not appear that the site is multi-language which might be a factor.
2. The mid value (432) contained in the GalleryPage.aspx querystring must be that of a Gallery module on the currently active page. That looks to be correct but as part of this test the DesktopModule.ModuleName property is assumed to be "DNN_Gallery". Please check in the Host-->Extensions configuration for the Gallery module that this name was not changed to something else.
3. The user must have view permission on both the gallery page and the module - it appears that this is the case for all users including unauthenticated users.
4. The ctl value (viewer) in the GalleryPage.aspx querystring must be one of 5 values of which "viewer" or "Viewer" is one.

Please check the Admin-->Event Viewer to see if any related errors are logged when clicking on a Gallery thumbnail.

You might try turning off the Enable Popups in the Gallery configuration to see if the need to login is removed and if you can tolerate having the image viewer displayed in place.

Another possibility would be to consider upgrading the site to DNN 5.6.2 (minimum but 5.6.7 recommended) and upgrading Gallery to 4.4.0, although I don't see that any issues such as yours were fixed in Gallery 4.4.0. I do recall, however, that DNN 5.5.0 introduced an issue with custom aspx pages inheriting from PageBase (such as GalleryPage.aspx) throwing an exception. It was fixed in DNN 5.5.1. If you do upgrade, be sure to follow the usual good practices of backing up both the file system and database prior to the backup. Also, Gallery 4.4.0 made extensive changes to the html markup of all controls and to the css style sheets of the Gallery themes for better XHTML compliancy. Any customizations to style sheets that you have made will have to be re-done for Gallery 4.4.0.

Let me know if I may be of further assistance.

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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