should i be concerned when i get a warning as i insert a new layer from the design centre? the warining reads: This application has detected a mixed version of AEC objects participating in this operation. Newer AEC objects will be disallowed from participating in this operation.Also, how do i rotate a viewport without having to use the ucs and changing dimensions and amending text to suit? 

Rotate viewport.
 
http://www.cadforum.cz/cadforum_en/qaID.asp?tip=3249