Looks like it's just me suffereing. But if someone wants to help me...
They only happen on pages with lots of comics and this is the message I get:
Access denied to this file
You tried to access the address http://www.stripcreator.com/forums/showthread.php?postnum=xxxxxx*, which is currently unavailable. Please make sure that the Web address (URL) is correctly spelled and punctuated, then try reloading the page.
Make sure your Internet connection is active and check whether other applications that rely on the same connection are working.
Check that the setup of any Internet security software is correct and does not interfere with ordinary Web browsing.
If you are behind a firewall on a Local Area Network and think this may be causing problems, talk to your systems administrator.
Try pressing the F12 key on your keyboard and disabling proxy servers, unless you know that you are required to use a proxy to connect to the Internet. Reload the page.
* xxxxxx is whatever page it's trying to load, not what it says in the error.