[*] [bug] The gallery says 20 pictures can be uploaded, but if you do that, the (Done) button disappears and is replaced with a warning message about hitting the gallery limit. I had to delete one picture (now 19 to upload,) to get the (Done) button back.
This possibly is due to your forum permissions and server php settings.
The forum can't exceed the php settings.
In UBB you have two gallery permissions
Max gallery images
Max gallery image size
On your server php values are
max_file_uploads
post_max_size
upload_max_filesize
I think you will find your are exceeding the php values even if you set UBB settings higher
