this sounds like a valid error coming from your DRC rule deck. Check the x/y dimensions of the CHIPEDEG ( CHIPEDGE ?) shape and divide it by your minimum drawing grid ( depends on the technology). Do you get an even or uneven number?
If you not get the same error on the old 5.1.41 database, check the shape dimensions there. Any differences?
Is it the same DRC rundeck between 5.1.41 and 6.1.4 ? Maybe the 6.1.4 DRC rundeck is more advanced and has some additional checks.
I can't see a tool problem here.