Internal Server Error (500 error)

Somehow this problem gets bigger and bigger on my server and now even effected WordPress so maybe you guys have ANY idea.

It all started like a month ago when I upgraded my invision power board from 1.3 to 2.0.4. So when I tried to make changes to the skin I got the 500 error. I contacted them and they said to get in touch with my host to get a more detailed info on the server error. I did that but what they sent me did not help at all, it actually is the same info I can get from the error log in the CPanel.

So while all this happens I get that error now as well when I try to make (or edit) a new blog entry or the same with pages. What I noticed is that when I try to keep the entry or the page real short (only a few words) it works, but the moment the number of words reach a certain ammount (didn’t test which ammount) I once again get the 500 error.

This is really annyoing since I’m sitting in the dark here. My Host has offered me to move my page to another server because they say the one I’m using now works 100% fine.

Maybe someone can tell me if the host has a more detailed error log where they get more than just a one line error detail (like they say they get)

Any help at all is HIGHLY apreciated ??