Problem in Editing Attchments

[mystikmedia]

Users are having trouble managing attachments after the original posting. That is, going into edit of a post, and then removing and adding a replacement image. They get an error like this:

Username, you do not have permission to access this page. This could be due to one of several reasons:

1. Your user account may not have sufficient privileges to access this page. Are you trying to edit someone else's post, access administrative features or some other privileged system?
2. If you are trying to post, the administrator may have disabled your account, or it may be awaiting activation."

Do you know how to fix that?

--------------- Added [DATE]1238956788[/DATE] at [TIME]1238956788[/TIME] ---------------

PS - these are recent posts...so no time limit issue.