Hi,
I found two bugs:
1) when the main player window is close to the upper boundary of the screen, the FX Channel popup window, when initiated, is rendered partially out of screen. The only way to deal with it is to move the main window down before choosing FX effect, which depending on screen resolution and player window scale may hide part of main window:
screenshot
2) With 1920x1080 screen, when Synchron player scale is set to 150%, it starts closer to the right bottom corner of the screen instead of being positioned properly (in the center), and part of it becomes hidden. This is most likely caused by a bug where initial position calculation always tries to position player in the center, but does not take the scale into account.