I came across this issue once in a blue moon. The other day when it came up, here is something that seemed to help.
- if you are signed in, sign out
- go to the forums and sign in (be sure to check the 'remember me' box)
- click on at least one thread in the forums
- click on the gallery
nutshell - don't go straight to the Gallery after signing in. Click around in the forums first.
See if this works next time you encounter this issue.
Carol