I blogged about this problem back in December. IE 6.0 won't let me view the source code on webpages I visit. The problem came back and instead of just erasing the cache like I did last time, I discovered that I could just lower the amount of disk space the cache was set to store. I've now reduced it to 100MB which, when I think about it, should be plenty anyway. Reducing the cache size also fixed the problem I was having with not being able to save .jpg files as anything other than .bmp's. Only time will tell if this fixes the problem permanently.