Found and duplicated a bug.
1. Edit Annotations on a drawing on a sheet layer (mine has a title block with a border as well).
2. File... Document Settings... Units...
3. In Dimensions window, change "Fraction precision" drop down to any other unit (in my case I changed from 1/8 to No Fraction).
4. Result: my Title Block Border goes crazy with scaling issues and stuff of that nature which requires a hard Ctrl+Z.
Don't change unit settings when in annotative edit view. Hope this is useful.
Cheers,