Hi,
i have the same problem.
I also tried to uninstall the last s&d version (1.6.xxx), reboot, and install the next-to-last version (1.5.2) and the problem disappear !
Besides, if i remove the 1.5.2 and re-put the 1.6 the problem returns.

I have three WinXP/Pro sp2 with this bug.