Er, I don't have it installed anymore. Never used it...
Have you or has anything else changed any of your display properties for the desktop? Going to a higher DPI (dots per inch) setting can cause display problems in programs, such as buttons being out of sight. I'm still on XP, you're not, but I could check by right-clicking on the desktop, selecting properties and going in and seeing what the dpi is set at. Normal is 96dpi, large is 120dpi.
On the other part of your ??? at Simforums, I had a bunch of thumbnails for IS1 that got eaten by the Avsim hack. I'll need to re-zip those files and get them uploaded again. I don't speak for the developer of IS, but I think the thumbnail problem is due to the file extension of .DAT for the IS2 thumbnails. I can see them OK, but for Vista or Win7 some people have problems.