A security token was missing or mismatched.

[Chuck S]

Not a problem yes your using the category cache if you dont want to use it turn it off in global options in admin

[paytraf2328]

Content visible to verified customers only.

How to become a customer? I have the same login in member area.
And I have the same problem.

[Chuck S]

PhotoPost Community - Announcements in Forum : Photopost Pro Bug Reports

That should assist you in becoming verified.

[kysales]

Missing Security Token and Internal Server Errors while uploading photos?

My members get this error only, when uploading large photos, I tell them to resize the photo smaller and the error disappears.

Any help appreciated

thanks

otis

[Chuck S]

Upload and then things go blank

without more specific information I would suggest you try those suggestions if your using GD2.