Thanks for sending the dmp file.
From looking at it, it looks like something has corrupted the shared memory heap which is used by the Windows shell. (e.g. This can be caused by something allocating some memory and then freeing it twice by mistake.)
It's possible Opus itself is responsible, but more likely that a shell extension is doing it (as we've only have one other similar report recently, at least so far).
I recommend using ShellExView to disable all non-Microsoft shell extensions, then fully exit Opus using File > Exit Directory Opus & restart it, to see if the problem goes away. If it does, you can disable a few shell extensions at a time to see which one seems to make the problem return. The first guide in my four links above covers this in more detail.