Cubase 12 Pro stopped opening a project. The only way I can now open it is with 3rd party plugins deactivated. Might be a stupid question, but what now? I tried to scan the plugins, and most (not all) were found, but they still don’t work correct. They don’t show right in the insert slots (mostly just blue boxes without the name showing) and can’t be opened. So what’s the next step?
As a test, and using the safe start mode and the Deactivate all third-party plug-ins option, I get a window showing all the missing plug-ins. Once the involved project loaded, you’ll have to reactivated them one by one, whether VSTi or FX in their diiferent project location (output routing, inserts…), I’m afraid.
OTOH, and even if it’s a tedious process, it will surely help you identifying the culprit. Once done, be sure to save the project under a different name, just in case. Hope you’ll get it sorted…
I solved this by moving possible problem plugins to another folder one-by-one, prior to starting Cubase. Culprit seemed to be T-Compressor by Techivation.
What exactly does happen when Cubase tries to open the project? Does it crash? If so, you can try uploading the crash dump here and maybe an analysis of the crash dump can show which plugin is the problem.
Added to what @fese just suggested, maybe try to use a backup of your project, if you have a recent one. This, to iron out the use of an eventual corrupted .cpr file…