Sorry I forgot to refer that. I said I'm using Web Wiz Forums
since version 6 but actually I'm using the latest version (v9.07) with MySQL.
I'd already tried to switch off friendly error in IE but I'm getting the same and generic error:
Internal Server Error
The server encountered an internal error or
misconfiguration and was unable to complete your request.
Please contact the server administrator to inform of the time the error
occurred and of anything you might have done that may have caused the error.
More information about this error may be available in the server error
log.
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I think it's important to say that after the error, the post was made successfully.
Thanks for your quick support