Same here. Steps to reproduce:
Windows 10 1909
Cubase 11.0.10 Build 321 (2021-01-13) Pro
Display 1: 3840 x 2160 (175% zoom)
Display 2: 1920 x 1080 (100% zoom)
- Open any VST 2 Instrument or Effects plugin (if it shows up on Display 1 then size is fine)
- Move plugin window to Display 2 (it will be resized automatically; still everything is fine)
- Close plugin window
- Reopen plugin window. It will show up on Display 2. Now the window size is too small
Workaround: Move small window plugin to Display 1 (it will be resized to a proper size) and move it back to Display 2. Now it has the right window size
I don’t experience this with VST3 plugins. I also don’t experience this if I enable the option “Allow window to be resized” for VST2 plugins.
So “Allow window to be resized” will do the trick. Unfortunately some VST2 plugins are drawn incorrectly with this option being enabled and the plugin is shown on a display with a zoom level other than 100%.