Continuing the discussion from Text Filter Alpha Channel Broken:
It does appear that the previously reported problem is fixed on Windows 10 with Shotcut 16.11.02, however there appears to be a slightly different problem on Linux now in the latest version.
When I add a text filter to a color clip and try to change either the Font or the Background, nothing happens the first time I choose something in the Please choose a color dialog and click OK. In order for the change to take effect, I need to click Font or Backround again (where I can see that my previous selections are still current) and then click OK again. The second time, my changes show up.
This is on a new project with a single color clip added to the timeline on Xubuntu 16.04 64-bit.