Has anyone seen this? I was modeling a part about 10"x10"X .125". All was well. Started adding some little text features to be printed in the finished part. These features we in trange of .2" tall by .12 wide. No features going to zero or anything stupid like that. on the 3rd letter I look up and the dimension button was gone. Quite gracfuly and did not save the part. Open part file no dimension button and no part. OK, reboot. Open earlier version of part file no dimension button no part. Hmmmm. Delete the "saved state" file. I get a part but no dimension button.
I killed that application and am currently reinstalling. (Hope the parts are OK.) I'll let you folks know how this comes out.
Update: I reloaded the app from the apple store (same verion I had been using) and that fixed the missing dimension button. The part however seems fatally corrupt. I remodeled the part in Fusion 360 and things went ok.