When the forum works <img src="http://www.jumpcb.com/images/images/10.gif" style="border-style:none; width:1px; height:1px;" />" is not in the default.asp code and I just do not know where the above is coming from.
When I When I remove this from default.asp the forum works fine, for a day perhaps, then the error reappears and I find the www.jumpcb.com url has again been added to the code.
I'd be very grateful to hear from anyone who can shed any light on what the problem.
This doesn't sound like its caused by a problem with the Snitz forum code. It sounds to me like its a malicious user taking advantage of an exploit or vulnerability on the server. Have you contacted your host? They may be able to secure the server, install a fix for the exploit or block the i.p. address used in the attack.