You must be logged in to view any attachments. Try this, and let's see if it helps:
1. go here:
Gallery at Splitcoaststampers
now you're at the front page of the gallery.
2. you'll see a list of links near the top that looks like this:
Home | Search | Profile | Upload Photos | Logout
click the Logout link (if it says 'Login' instead then don't worry about
this step)
3. now it looks like this:
Home | Search | Profile | Upload Photos | Login
click 'Login'
4. below the Submit button click 'Login Problems?'
5. click the 'Delete These Cookies' button
6. then login again as normal, being sure to click the little box that
lets you login automatically.
7. Never, never logout.
That should fix the issue with posting, and being able to view the attachments in the forum, too!