[Lynne]

OK, check all these:
vboptions > Message Attachment Options
Attachments > Attachment Manager > check each type to see the size allowed
Attachments > Attachment Permissions > check to see if any of those are edited from default (in red)
Usergroups > Usergroup Manager > select usergroup > Attachment Permissions (check for *every* usergroup)


Those are the only places I can see, besides the php/mysql settings, that would limit the size/amount of the attachments.

Also, note this about the size:

Enter a byte value.

1024 bytes = 1 kilobyte
1048576 bytes = 1 megabyte