I have a sort of odd sounding report. Whenever I have "kill mission timers" enabled, my game crashes (to desktop, no message) in stores when I try top buy something. (confirmed on clothes and body-shop)
I'm using the steam version on chapter 3. I can not begin to guess the connection, but I've tested it a dozen+ times. It is fine if I remember to turn it off before shopping. I see no one else has posted this issue, so I am.
Just don't spend money while you gave "kill mission timers" enabled.
Steam version still not working properly. Money doesn't work, also Health, you'll die when you're shot in the car.
Mine is working fine, check that you are using it properly. Health is not 100%, as stated in explanation on first page. If you get hit by a shotgun at close range YOU ARE DEAD no matter what.