Having just installed version 6.01 i have found a problem.
All library parts i use in construction are positioned using assisting geometry lines / points. These parts have been created in version 5.04 or earlier releases and worked ok.
Version 6.01 does not recognise these points / lines. In fact, the library parts can not be positioned using any reference point.
lines / points also cannot be deleated from these parts in version 6.01