evn64 - 1:48 pm on Nov 7, 2011 (gmt 0)
The issue is solved. It turned out my IP-number was blacklisted by the hostingprovider in a special way so only scripted pages were blocked, due to 'possible security risks, coming from this IP number'. They said I must have had a red warning page before I was blocked, but I haven't seen it.
Thank you all for taking interest!