Now on v4153. GUI upscaling seems to have disappeared, but I’m having clipping issues that (as I recall) GUI upscaling had addressed.
Not sure if this is an @brad issue, or I’m missing something in the way the v41xx versions work …
Many of my plugin windows (SWAM, Respiro, Omnisphere, Reaktor, Cherry Lowdown, Agean Pitchproof) look fine, but others are clipped, with no window re-size control to be able to correct or adjust. The most problematic (for me) is Kontakt:
The only thing that’s changed with regard to this in 4150 and later is the default for VST 3 plugins are now disabled for upscaling by default.
You can adjust this setting on a per-plugin basis - right click on the plugin slot, choose properties and there’s a setting for plugin upscaling - it affects all instances of the same plugin and requires restarting Cantabile.