I had to revisit an app I wrote in RS 2012R1.2. I am now using Rs2012R2.1. It worked perfectly in R1.2, but in R2.1, the canvas is not refreshed. I found that the code ‘Invalidate(False)’ is where the difference/error occurs. Can anyone tell me what is different and more importantly, how to fix this for 2012 R2.1?