Since the windows 11 update 2 days ago, when opus is open and I open a pdf, nothing happens. Acrobat processes open in tasks but no visible window. You have to close opus, kill the current ACROBAT tasks and it works.
I'm just reporting information for the developers.
What Acrobat does is up to it. We aren't really involved in any way with it.
If it behaves differently depending on which program launches it, I'd suspect antivirus. Windows Defender can cause some strange issues at time, especially when anything that opens documents containing what it considers private data. But, other than being the program that launches it, Opus has no connection to Adobe's software or what it does.