[roann]

(1) Drag & Drop:
Options > Preferences > Shell integration, mark Integrate TLH into Windows Explorer, press Apply, close TLH, reboot. If it still doesn't work, go to Options > Restore shell integration, close TLH, reboot.

(2) Error There isn't anything to save (process log is empty):
This comes up if you press Save and there's nothing logged (it's only coded in the procedure called when that button is pressed). When processing a task the Save button is disabled so this error message cannot be displayed.

(3) Error Cannot focus a disabled or invisible windows:
Did you try to drag/drop or add files via Windows Explorer context menu when TLH already is processing a task?