9.5.4 64bit on Windows 7 won't sort folders

I'm ripping a LOT of CD's and creating bunches of folders. I discovered when trying to float the most recently modified folder to the top that Directory Opus is not sorting anything when all I see is folders. Not "name" "size" "created" "modified" ... nothing. Clicking on the thing I want to sort has no effect at all except to cause the little arrow to change it's pointing direction. When I get into a folder with only files ... sort seems to work fine. However, I'm stuck using Windows Explorer now, because I need to be sorting and manipulating folders. Anyone else seeing this problem? Specifically, I have 9.5.4.0.3806.x64

You've got "Keep folders sorted alphabetically" turned on in your Folder Formats.

Yep .. as you said. Thanks for the answer. I'll look a bit harder next time, but don't actually remember when or if I ever set it to keep the folders sorted alphabetically automatically. I suspect I did.