Windows Vista Home Premium, FF 3.6, Iron 8.0 and IE7. I have to run the scan twice. It was just leaving a few IE thumbnails, but now it's leaving IE temp files as well. Before the last update, it was clearing all files. Problem is, I never use IE. I don't know how it has any files to clear.
Couple of things here:
Many aspects of Windows programs and the Operating system itself use Internet Explorer (or to be more specific Trident, the base code of IE) thus not using IE ever you will still find IE cache/tempfiles building up.
Where exactly are the: "few IE thumbnails, but now it's leaving IE temp files as well"
are you looking at the physical files and thus you know that it is leaving them?