cant really comment as I'm using Caliber's trainer however have noticed with Caliber trainer if your crouched in a bush when you activate stealth mode you get stuck in the crouch position until you move into another area de-activate and then re enter the area.
Got to say though 90 I was one of those who also found the Inf ship health didnt always work although the old version didnt crash the game
Experiencing the same with the Stealth Mode. Enemies still see me when I bumped into them. Caliber's trainer's Ghost Mode is the only working one for me. Caliber's Stealth Mode isn't working on my game though.