It appears that measurements on drawings in metric scale are being converted to imperial measurements internally and are being rounded to 1/100th of an inch. This results in hair-line cracks between objects. Would expect that drawings set in metric scale would retain their actual values.
No, internally the Drawing canvas uses 1/100mm, with conversion/rounding errors when other units px/pt/ch/inch get selected.
*** This bug has been marked as a duplicate of bug 44267 ***