This is probably related to other issue reported. Using Ableton 10.0.6b3, Mac 10.13.6 (High Sierra). I have saved a set as my default, which contains Pro-Q 3 (VST) on a track. This instance of Pro-Q 3 has a preset that I defined and saved. When I reopen Ableton and click on the Plugin Edit button of Pro-Q 3, none of the eq settings that I had saved are there, though the name of the preset is correct. If I select previous preset then next preset in Pro-Q 3, the preset settings then appear in the window and it works as expected.