There is something strange with the forum. Some of my posts can't be posted or previewed. When previewing it will just wait forever and if posting it will give internal server error.
I have to delete part of my post until it accepts it. I can't narrow down what causes the problem.
This was probably related to an overzealous security filter used by the webhost. It does block a lot of attack attempts, but occasionally crosses the line.
I just had them add an exception for the rule that was blocking posts so hopefully it won't block your requests anymore.
I see, thank you.