Hi
I have the same problem on 2 different windows 7 machines.
Any notification in the task bar steals focus from jriver, and the only way to get it back is to click on the icon in the task bar.
I also have strange behaviour of the DSP studio window. It often disappears behind the main MC window and is difficult to get back. I have to minimise the main window. Just clicking on the DSP studio icon doesn't give it focus.
I do not have this problem with any other program, and it has happened on all versions for MC from version 15.