Performance mode window does not show graphics

[muziker]

Using Iannix v0.9.20-b-16-g287b51d

When toggled into performance mode, the resulting floating window does not display any graphics. Clicking on it to create objects, on the other hand, works and in objects are created in the main window.

If the iannix is playing and the performance mode is toggled a few times or the performance window is hidden, eventually the program will hang.