Originally Posted by
Silencer
Are you launching rtst as admin also? It should still work even starting it after ps2... Just not recommended on 8.1 x64.
You can also uncheck and recheck enable direct x with testing it, that's the same thing as restarting rtst.
If both are running you may want to triggering a device reset, by switching ps2 res / going full screen to windowed or back. Rtst may pick up on that and start working.