TI Snow + Live 8 + Vista 64 : Drivers seem fine, Plugin doesn't show. spmadmin 8. Oktober 2009 I have the exact same issue - also made a post about it...
TIOS 3.3.0.00 Public Beta has been released spmadmin 4. Oktober 2009 Installed on Vista x64. Driver seems OK (no err messages, at least) but Ableton Live rejects the VST plugin - it does not show up in list of plugins. This works OK on WinXP x32 though.