Hi @popitup yes this has been reported by others using Cubase on Windows 11 since Scaler v3.1.2. and is currently being investigated by the dev team. Most users are able to simply reactivate the plugin without any issue. Otherwise we’ve found that uninstalling then reinstalling Scaler 3 resolves the issue, however other users have posted solutions in the following thread: Cubase 14 Pro puts Scaler 3.1.2 on a VST Blocklist - #20 by lee