I'm using Win7Pro64 and ESO64 was working well (& looking good) both on the PTS before live release of TG as well as live *after* Thieves Guild DLC.
Now I crash frequently and see missing graphics (those pink mounts are *not* cute!) since this morning "fix".
Even earlier this morn, before hotfix was pushed to live server, ESO64 was working well.
And, yes, I did use the "ESO64.exe" file for both PTS & live.
uh, Thanks
Sigh