The module is very nice but only when it works.

I have experienced problems installing it and decided to completely uninstall it and start from scratch. I uninstalled the module and deleted the corresponding 2 db tables.
Now, I reinstall it but no new db tables are created. Also, I can neither delete the previous cache folder brilliant_gallery_temp nor create subdirectories and the newly created main gallery folder (attributes locked to 755).
Any clue?