Group em and just press the group number to check on em and reapply is need be as the options apply to selected units aswell as ones u hover over.
just make sure ur not hovering over a enemy lols
Again, easy enough to say - doesn't work on STRUCTURES you've chosen to make "invulnerable" - so you can lose that rushed base without some strategy. Or, if you use a superweapon to clear out the rubbish in a newly-captured base, you can still kill the critical structures accidentally. Again, no easy answer there since an actual freeze isn't happening.
Also, on Outposts, Surveyors, and Battle Bases you have to hit it THREE times to ensure the unit doesn't die - once in vehicle mode, once while unpacking, once when set up. Seems that even though the bar doesn't change, the actual health resets once unpacked - and Outposts and Surveyors have their own special health setup while in the process.
I got another problem, i have the 1.4 patch and the 1.4 trainer but when i press f6 and f there health go to 0 and they die with one shot. its really annoying and i cant undo it.....
Absolutely sure you're not kitting "a" instead? That'll zero out health on any unit you hover over...
Easy enough to do, if you're using a keyboard that isn't the "US/UK English" that the trainer was designed for... as I don't know for sure it's easy enough to speculate.