same thing, even with glow mode set to 0 after a computer restart the black box appears. Only by restarting dwm fixes the issue for some reason dont know if this helps but i dont get any error after a restart in the debug.log except for: [2014-01-22 05:50:51][0x78:0x188] CoCreateInstance(CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER, IID_PPV_ARGS(&pImageFactory)) failed with 0x800401F0PS: I dont get this error if i only restart the dwm