Hi Tony & Burr, thanks for reporting this bug.

I've attached an updated SidePane.htm which you can copy over top of the old version in the \ui subfolder which should solve this problem.

The bug was in trying to initialize the size part of the object properties panel, if the bounding box of the object was not able to be retrieved.

Construction lines don't give back a bounding box since they are infinite, and the other one that you saw Burr was probably due to the little sliver being a kind of collapsed down surface that failed to mesh.

Please let me know if you still see this problem with the updated side pane.

- Michael