Installed Vegas 7a on two machines, both already had Vegas 6d and Acid 6b with shared custom media library.

Install ran fine, but then neither Vegas 7, Vegas 6 or Acid 6 could open default or custom media libary. Tried creating new library in 7. Media library crashed.

Same problem on both machines (XP SP2) - one Thinkpad, one custom desktop. Uninstalled 7 and everything starting working fine again.