Strange one this, seems a few people are having problems with 1.3! I downloaded and installed over the top of 1.2 when Powerless fist informed us of the release and after running it every night since there have been no problems.
i have had no problems with 1.3 but my friend who runs similar system to mine has had nothing but probs and has reverted to 1.2. the only difference in setup was that i use spywareblaster and he tried to use 1.3 to block spyware.
Recently downloaded 1.3 over 1.2 everytime I ran a scan I had 2 warning triangles with something in german. Below that I had congratulations no items found but then I got the widows error message and spybot closed down. Downloaded on my kids pc over 1.2 and they run ok. Uninstalled from my own and reinstalled from major geeks "touch wood" has run ok since.