I can only think of two things that may cause it that is not related to server or .php problems.
One is attachment permsissions, but I cannot see that being the reason. Most likely is usergroups "attachment permissions" with the "Can Upload Attachments" set to no.
There is many options in usergroup, very easy to make mistakes if you are just speed adjusting one usergroup after the other.
Other than that, no clue, so might be more of a technical prob. *shrugs*
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