BlueCat plugins don't draw a UI in the plugin host

BlueCat plugins don’t draw a UI in the plugin host. I’m using latest code from develop and the latest VST plugins downloaded here:

These plugin used to work, any ideas what changed?

Is this on macOS using the latest SDK?

This looks like windows if the close buttons are on the right?

Sorry, forgot to specify Windows 10.

OK thanks, we’ll look into it. In the meantime, as you said they were displaying correctly previously, are you able to do a bisect to find out which commit may have caused it?

I haven’t tried that, it was about two years ago that I’m certain it worked. I’ll try and narrow it down more than that.