Screen Painter Form objects change size

I have had a problem where objects on a screen painter form change size if I change the resolution on the monitor.

When I change the resolution back there doesn't seem to be anyway to get them to revert to the original size.

I have tried looking for values stored in the xml and haven't found anything. Also I have experimented with Form Settings to no avail.

Has anyone else experienced this?

Thanks for any suggestions.