1, 2 - Van helps everyone, poor guy. 
3, 4, 5 - Mine only crashes(Win7 64) if I edit a part with a sketch open, and even that is rare. Crashing would be a deal breaker for me if I couldn’t fix it.
6 - Sounds like you might not know the rules FZ uses, which is normal because there isn’t instructions.
7 - see above
I’m not here to sell FZ, but if you post sketch we can look at it and see if there is something you don’t know. I seam to learning something new in FZ every month, and that’s after 4 years. I know enough now that I can work around problems in FZ, and the only bug that I sometimes see, which is only in complicated sketches, is a redraw bug. A simple restart fixes that.
I don’t blame you for quitting if it constantly crashes - I gave up on Linux after a couple of years because it keep crashing my PC(Celeron era) -, even I would probably give up.
If we can help we will try, but remember we are just volunteers who aren’t super experts.
