I have nasty problem with this module.

When I create a gallery trough the script I can't upload files with my ftp-client, I can't even change the CHMOD of the directory :-/
Even when I give all the permissions to world.

Is there a .htaccess file in a gallery?

There are similar problems with files and folders created by php scripts. Strange but true, php scripts have rights superior to yours as an ftp user... I can only advise to google around a bit, there are tons of help-out scripts out there, but I can't find the one that I used some time ago, sorry.