Two bugs

Just reciently two bugs have come up into the light. The first one isn't overly important. I think it may have ocurred in the last update but we are no longer able to upload an avatar, it just says that the image doesn't meet the requirements no matter what the image is. The first thing I checked was that the avatars hadn't mystically turned themselves off but all was good. Thought that maybe something in the code may have been a little twinked. Any avatars that had been done before the problem showed up haven't been effected.

The second one is a little more serious, we are unable to ban people. When you press the 'ban' link (after all of the information has been put in concerning the ban) it comes up with this Error: Unable to write bans cache file to cache directory. Please make sure PHP has write access to the directory 'cache'.'. The thing with it though is that if you look at the bans list in the admin section of the forum they are actually put on the list but no ban really takes place. The same error shows up when you remove the ban from the list. My theory (although I don't know how the ban has been coded) is that the error takes place after its added to the ban list but before it can confirm any ban with the account in question. As I said, I am not sure how the ban list and banning an account are actually tied in, the problem could be lack of communication between the list and accounts. All accounts banned before this problem showed up have remained banned.

Any help in this matter would be greatly appeciated.