I stumbled upon this strange behaviour in a lot of Directory Opus versions, but I was always too lazy to ask for it...but now I'm fed up with it:
Let's assume, a DOpus Lister is empty and an external process generates files in its directory it is currently showing. The slider will appear...sooner or later (you could also use the "Find" function to search for * files on C:). Now try to move the slider up and down. On my workstation I always loose the slider again and again...and again...as long as the directory doesn't get refreshed anymore.
Is that a bug? Or can it be configured? Am I the only person suffering from that issue? I tried to reproduce that in the Windows 7 explorer and it's working there without any problem.
Thank you for your support and information!