I just moved my website to a bigger server ... the IP address changed, which means that some people will not be able to see the signature images from www.progtology.com (or browse that website) for a few hours. I can't do anything to speed it up - the DNS servers cache the IP entries for domain names.
You don't need to change anything about the URLs of the signatures - they will soon work again.
Sorry! But the upside of this is that the performance will be much better from now on.
BTW: I'd appreciate if the admins could keep this thread alive in this frequented forum section, so the sig users get a chance to read it ... the problem will be gone tomorrow, and then the thread can be deleted (thanks in advance).