There has been a long standing issue where settings are not saved for some users on 64-bit Windows Vista / Windows 7 due to the fact that WT was saving to the local Program Files directory.
In an effort to fix this, WindowTabs is now installed to your Local User Data directory instead of Program Files – this is the same way Google Chrome and all “ClickOnce” .NET applications are installed.
Also, I will be moving to a more manageable release cycle (2-4 week) which will give me time to tackle bigger features between releases.