Giasan,
If you need a quick fix until they get the spell checker working again, (it has not worked for me in my listings in a very long time) google toolbar when downloaded and installed offers an excellent spell checker that will work on any page where you can input text. I've found it extremely helpful even when answering questions through ebay's ask seller a question. It's easy to mistype even if you're a good speller and I really wish that more sellers on ebay paid attention to spelling.