High Resource Usage

Why did I open the Windows Task Manager and find Dopus using Very High power usage and 8GB of RAM?

Then closing the Lister, the background process was still using the same:

It's unlikely to be Opus itself, unless you're doing something unusual with it.

High memory usage is usually due to bugs in shell extensions something else has installed.

Well I closed out Dopus and it went back to normal.
Then when I'm encountering this Godawful 'In Use' error again, the high usage happens again.
The viewer pane has been closed this time.

Trying to rename a wav file:
In Use

Trying to delete or change metadata on a wav file:
Another Process

Could it be misreporting the resource usage because I launched the third party program using a button?
App Launcher

I think it's DVD Video Soft that has the memory leak.