Character not confused, but will only target league mates to attack

[Ukase]

So, this has happened before (a couple of years ago on an ITF); still not real sure of the cause, though I do know the solution. 

Today, I had two accounts running, but only one on a map. The 2nd was on the character selection screen. 
I was in the labyrinth, fighting the minotaur, and when I zoned into the arena to attack, my target changed from the mino to a league mate. So, I targeted the mino again - same thing. (same league mate, too) 
I then targeted the mino again, and used my mouse to fire, instead of the number keys, and had to continue to use the mouse instead of my keyboard until the fight was over to implement the solution. 

And the solution is to close the 2nd account completely. 

I've had situations like this happen before, back when I was afk farming on 2 accounts, and actively playing on my first account. Shutting the other accounts down resolves the issue. 

I'm fairly certain this has nothing to do with the labyrinth, as it's happened before. But I can't reproduce it. I'm only putting it here because of the solution I've found for it, as it might be helpful to others. 

[Greycat]

Alt-tab out and back in.

 

If they're not showing as hostile, but all you can do is select teammates with the number keys? Yeah. That's been going on for a while, has something to do with having multiple windows (not necessarily COH windows.) 

 

Alt-tabbing out and back in has always fixed it for me.

[TygerDarkstorm]

Shift key could also be stuck down since shift + a number key targets teammates iirc (or is that in WoW?)