Since our recent C/I update, some of us have been experiencing a strange plan view window sash issue that causes the sash to offset from the width of the window frame:
I just received a suggestion from Cadimage that solves this. Select all windows in the 3d view; I used a find & select to get only cadimage openings. Then go to the following settings: Custom Settings > Setout > Dimensions > Size Measurement > Dimension to Panel Edges.
The result is a correct and cleaned up window. I have not tested this against multiple panel units, but it works for a single unit without any resizing, or 3d errors and can be changed for all Cadimage windows at once.