We have about 70 different extensions in the 'manage attachment extensions' section. After they are all listed alphabetically with the extension group being shown as not assigned, they appear again but grouped together in about 10 groups of similar file types (some groups have 2 extensions, 5, some even have 15). However, if I look at the group extension they are assigned to, every single one of them now say Archive instead of not assigned.
Now when I go to the 'manage attachment extension groups' there are 6 different groups (2 say allowed in posts, 4 say not allowed). The groups are:
Archive - Allowed
Images - Allowed
Documents - Not Allowed
Downloadable files - Not Allowed
Flash Files - Not Allowed
Plain Text - Not Allowed
Both the Archive and Images settings have the box checked that reads "Allow all Forums."
The maximum file size was set to 0 on both of the groups so I changed it to 50,000,000 bytes as that field doesn't specify 0 is unlimited.
Still am getting an error message when trying to upload an attachment that reads "The extension jpg is not allowed." It will say that for any type of file .pdf, .jpeg, .jpg, .png, .bmp, etc.