Hello ! I've tested with a new Ardour session. Just one track, and the plugin on the master section. Everything seems ok. It's strange, isn't it ?
Have you tried to reproduce the problem by using ONLY LSP Plugins on new project? No, I will try... But the plugin is at the very last place in the master section...
Hello ! I have the kind same GUI problem here but tested with lsp-plugins-vst-mb-compressor-stereo. Since version 1.1.2. Tested with Renoise 3.1.1 and Ardour-5.12 64bit. Also with Ardour, the sound master stops after some time, maybe when the full bands are working. Maybe because i'm using denormal protection parameter on the tracks and master section... When I bypass the plugin, the sound comes again... Tested many times on the same project. But nothing exotic in the session : just some calf plugins,...