adding to what freymann just said, the problem only exists with Toggle power after a quick reload. If you are lucky enough to have Discreet IR codes for power, you will have no problem. The reason is because LMCE does not remember device states after a reload, and defaults to always thinking the power is off. So, with a toggle power device, you can see how it can throw the system out of sync if you do a reload while the TV is on.
To keep this from getting you, always reload when your TV is off an there will be no problems. I'm sure eventually we will come up with something more graceful. There are a few bugs with toggle type control (with both toggle power and toggle input) that I plan on working on after the svn merge is complete.
Also, the 5 minute delay before auto-power off is adjustable. In the webadmin, under orbiters, adjust the power off and screensaver delays to where it makes most sense to you. I keep mine set at 60 (seconds), so that if nobody is using LMCE, the TV goes off after one minute instead of 5.