I also noticed this as well and it only occurs when the dimension distance is small. It leaves the appearance of an "X" instead of a "/" when using continuing dimensions.

I think this occurs when using previous ICAD drawings with an updated version of ICAD.

When I tested new versions of ICAD with new layouts this problem didn't appear.

I would say it may come from settings in the dimensioning conflicting with the openDWG's specs.

John Finlay