I use Revit Arch 2009 and if I try to move a line less than 1/32" I get this error "Element is to small on screen". This cause problems when trying to align instances and they are less than 1/32" apart.
I get the same error if I try to draw a line less than 1/32", the symbol of a circle with a line through it appears.
Help, I have to do a lot of aligning and I have had to move the instance away futher than 1/32" and then move it back again to get the alignment correct. I hate doing things twice that I should be able to do in one move.