Whenever trying to have 2 roblox studio windows open at once, this shows up. This only started happening in the latest update and some other people have had this problem recently after the latest update as shown here:
I also checked my activity monitor and made sure only one instance of roblox studio was open but the issue still happened.
My system information: 12th Gen Intel(R) Core™ i5-12500H
8.0 GB Memory
Intel(R) UHD Graphics
I tried this on an empty baseplate and simply clicked on opening a new roblox place in the file tab and the issue occured.