1. crashes
I don’t see any problems with dragging a file from Explore. Do you see any conditions?
2.
Large File Controller always shows up, even when I open a file with 4 KB.
Please check what you set in the “Minimum File Size to Open Asynchronously” text box in the “Advanced” tab of the Customize dialog box. Any file larger than this file size will make the Large File Controller show up.