I only have problems with Win 7 x64, though I don't have any Vista or XP x64 boxes. I reset updates (reinstalled net 7, deleted version text files to force client update) and everything works fine again. As a note, I've been running in XP compatibility mode and as administrator the whole time, so that didn't seem to help the problem. I had done a complete reinstall, which fixed the problem until I tried to gate again. But, now it seems to work fine; no problems gating yet, no client crashes. We'll see if it happens again.