HI, probably someone has reported this issue already but I couldn't find it.
It happens often to me that I leave an open project while I do something else on the computer. Then, if I forget I did not close the project, I open Samplitude and select the project I'm working in, but then when I save it, the older window remains open and it does not update with whatever I've changed on the new window. Today it happened that I was saving and then I got an error message telling Samplitude could not rename the project (I guess sam tries unsuccessfully to rename the project in the older window).
What I expect is that if you try to open a second instance of the same project, the program should at least warn you that you have it already open or even simpler, just expand the hidden window as you click on the programs' icon. I hope MAGIX solves this any time soon, 'cause it's very annoying.