I have the same issues you describe with lowdown bass pedals vst.
on win7, for me on my tiny screen (by comparison)
The part where it scales down after the window is closed could be that
the vst is scaling to fit the screen vertically when its reopened, which it does (for your screens, probably it’s native size). I can scale it up to 150% then when I reopen it, it’s back to just under 90%.
I’m having a similar issue with SurgeXT VST and have been meaning to document it and post to this forum. I suspect it can be fixed by one of the Cantabile GUI settings, but I don’t know which ones.
Looks like you may have discovered a bug in Cantabile. I don’t have the Cherry Audio vst, but I get a similar scaling problem with Surge or SurgeXT, like dbrendon says. This weird scaling behavior only happens for me in Cantabile C4. If I open Surge in version C3, the plugin scales properly.
I tried disabling “Plugin GUI Up-scaling”, but made no difference. I also tried disabling “Hi DPI User Interface” and unchecking GPU Accelerated Rendering (OpenGPL)" in settings, but made no difference. Hoping @Brad can look at your video.
I just tried C3 just know, (out of curiosity) I have the zooming issue shown in the video
however it is only when I zoom in. when i click and drag to zoom out
there is no issue.