Hi-
Preferences->Transport->Return to Start Position on Stop, checked or unchecked the cursor always returns to start position.
Spacebar, numberpad +enter/0 combination or clicking stop in Cubase – it always returns to start.
On an Avid MC Control- the transport controls always return to start,
BUT on an iPad/Lemur the start/stop buttons (MIDI 115 & 116) function as expected.
This has been driving me slightly crazy but now, in tedious editing mode, it’s growing legs. 
Any help is appreciated!!!
UPDATE: QC controller Start/Stop also always returns cursor to start position no matter the preference settings…ARGH.