I have a Windows only problem that was also there with the old beta but now it’s happening less often.
When I open a file from Explorer the current Sublime workspace (window) gets duplicated and the selected file is opened there.
This only happens sometimes (after a few hours) … when I close all Sublime windows, start Sublime again and then open a file from Explorer it is opened in the existing Sublime window (like it should).
Maybe this can be fixed for the next beta?