What's the dif? (drive icon fandango

[cranioscopical]

I face a mystery.

Directory Opus is one file manager that I use.
Periodically I notice a change in its display of drive icons (I refer to the appearance, not the difference in drive letters).

Sometimes they appear like this:

At other times like this:


These displays switch from time to time, but I can't see what causes it. 

I'm not even sure that the phenomenon is limited to Directory Opus or if that's the only place I happen to have noticed it.

Any ideas?

[mouser]

no idea -- i use dir opus but use small icons so i never see it as anything but plain tiny icons with no progress meter, etc.

[cranioscopical]

Found it, thanks.
It's Anvir Task Manager Pro that affects the display, (a product that is mentioned in this topic).