I found a small issue this evening while playing with my favorite tool
After running one of my test systems in live mode for a while, I decided to switch tests.
Rather than click on the "stop system" toolbar button, I just selected "close trading system" from the file menu. As you would expect, the toolbar showed the live data was still running and the trading system buttons became disabled.
However, RE didn't actually shutdown the live system.
When I opened a different system and tried to start it, RE reported "a system is already running" and there was no way to stop the running system at this point other than shutting down RE.