Converting an old Desktop app from Xojo 2016r3 to Xojo 2020r2.1

General
1

When converting an old app from Xojo 2016r3 to Xojo2020.r2.1 I noticed a couple of things:

  1. a transparent Canvas background was suddenly not transparent anymore in 2021r2.1, but darkgrey. Despite the transparent switch was on. In 2016r3 the background was transparent

  2. Chartpart 2 gives an error, some paint option in canvas was changed.

Any idea?