In the OLD IDE, if I open a sketch, and select a board and upload to that board, and then open a new sketch, and upload to that same board - it works ok.
When I try to do the same thing with the BETA IDE, I get this error:
avrdude: ser_open(): can't open device "/dev/cu.usbmodem1463201": Resource busy
Upload error: Error: 2 UNKNOWN: uploading error: uploading error: exit status 1
This may be the desired behavior, I am not sure.
For my workflow, I often jump between different sketches, uploading them to the same board, back and forth. This worked fine in the previous IDE, I just clicked upload when I had a new sketch to upload.
Now it seems, I have to go and select a different board, or close the other sketch that I had uploaded to.
I hope this makes sense!
Just a thought.
I am on macOS BigSur and using IDE Version: 2.0.0-beta.7