Of course @kitcat couldn’t solve that on Windows, given that is wasn’t solvable without my help on modern Windows versions, and kitcat didn’t choose my paid services.
I’m pretty sure PsychoPy or any other software won’t solve this either, given how far they are technically behind PTB wrt. visual stimulation.
Transparency does work on both Mac and Linux, unless you do something wrong or got very unlucky and hit a macOS bug specific to your OS + hardware setup.
My offer for a solution on MS-Windows was in this message in response to you at 1st December last year, which you ignored. Apparently your work time is free, so a 200 Euro christmas offer was deemed too expensive for solving your problem in a timely manner?
The solution still exists, but the generous christmas offer is of course no longer valid, so this would come in at 500 Euros + applicable VAT for a 200 Euros support membership + then buying an extra hour work package for 300 Euros without discounts.
Good luck. Locking this thread.