DO11: New shortcuts and copying directories

Thanks in advance for any help.

I've been using DO for many years in the dual horizontal view. Since installing DO11 (now using beta 2), I've been having all kinds of problems inadvertently creating shortcuts and moving directories. I can't figure out what I'm doing, but if I click on one thing and then click on another (intending simply to select it), I end up moving a directory.

Is there a setting I need to re-set? Any help would be greatly appreciated.

Maybe you'd turned off Preferences / File Displays / Mouse / Allow drag and drop into sub-folders (without a qualifier key held down) before, but it's on again now (due to doing a clean install without keeping the old config, perhaps)?

Thanks very much!