Having just moved to a AutoCAD Architecture 2008, I have joined the ranks of those who have troubles with the 2007 DWG format.
The first one is that UCSFOLLOW gets reset to “0” every time we open a DWG file. This apparently has been going on for a while and is still not fixed. Here are a few threads that might help address this problem if it effects you.
2007 resets UCSFOLLOW to 0 – AutoCAD Forums [1]
AutoCAD LT 2007 set UCSFOLLOW to 1 permanently – AUGI Forums [2]
CAD Forum – How to switch off UCSFOLLOW in all viewports of all… [3]
ucsfollow help needed. – AutoCAD Forums [4]
Saving changes to system variables [5]