I know issues about sort have been reported before, but this is a new issue. I had sort working fine yesterday, but had an issue and had to disable IMCE in order to install a dev version of WYSIWYG to fix another problem I was experiencing. I disabled all modules requiring WYSIWYG, deleted WYSIWYG, and then installed the dev version. I reenabled IMCE and the others and have been using it. I noticed today that I can no longer sort at all in the file browser.
I'm running the latest version (7.x-1.9) and have made no other changes. Could it be the dev version of WYSIWYG? Or is IMCE separated enough that it is an issue with this module?