KB10397 - When I open and old project (created with an earlier version of the DK) in the DK 8, I sometimes get the message: Error reading "GIS_ControlLegend,IconWidth Property....". What's wrong?

Everything is OK. This message reflects the fact that the DK v. 8 introduced a few new properties in the visual control, and a few other properties were removed. Just ignore the error. The error message problem can be made to disappear by altering the form just a bit (such as change the size) or by editing the source code associated with the form.