I'm really sorry that since I swapped host a lot of people have not been able to upload certain types of images. This is something to do with my host and it's not something I can fix, I need to contact them. I just wanted to let you know i'm in the process of negotiating the fix, otherwise i'll just have to get a refund and try somewhere else. I'll keep you posted

This is a problem with the host and a configuration setting in their php.ini

However I visited the phpbb forum and modified some of the forum code and implemented a work around. You shouldn't have problems anymore.. but if you do please let me know.