I kinda have mixed problems with the bug. Before, if I left an IE window with a loaded web page for too long, the app would screw-up its own picture cache (at least I think that's what it did) and regard all (yes, *all*) pictures on the site as a bitmap called "untitled".
Now it doesn't do that anymore and thankfully still regards the pictures as what they truly are. But I have still encountered the bug occasionally, although it only seems to be with certain ad animations of some pages (Some of these ads can be saved as they are, while some of them will insist on being copied to your hard disk as "untitled.bmp").
Although there's one question to ask, Twist: which version of IE are you using? Hope the bug still isn't there in v6.