Hello Roberto
I tried exporting the drawing sheets in dwg and dxf format and imported them back in SpaceClaim to check out the issue. I couldn't see any change in the arrow sizes. Since I don't have access to Autodesk I couldn't check it.
You mentioned that these errors often occur when there is an imported geometry with errors. What if you fix the errors? Also, If you create a simple geometry like box, then add a drawing sheet with dimension and export it in dxf or dwg format, how does the arrow size appear in Autodesk?
I am not sure if this issue is on SpaceClaim side or on Autodesk side. Are you seeing this issue with earlier versions of SpaceClaim as well or is it specific to any particular version?
You are navigating away from the AIS Discovery experience