Transmission trouble car will go into all gears but it will not move; the car doesnt roll in neutral..

Did you flash transmission,could be the problem!!!

this is a photo of what could be your problem, the nut that hold the manual shaft has too much end play ,
you have to remove transmission oil pan,

When you say it is stuck in neutral what is stuck? is the shiftter stuck in the neutral postion or is the car not moving when shifter is placed in drive or other gears,
if the car doesnt move in gear i would say it is transmission releated, this may be a bad tranny or fluid is very low.

check your transmission oil, make sure it is full. this is were i would start,

Do you feel any resistance in the gear selector when shifted through gears?

a car wont roll when in gear

Easy fix, it's your transmission linkeage bushings. They do break because they're plastic. Dorman makes them.

When you have the vehicle in Neutral it should roll. If it rolls in Park you have a transmission problem. If your talking about a few inches when it is on a hill it is just play in the gears and you should use the Emergency brake when parking in that area to reduce strain on the Transmission.

mal adjusment on gear box have a pro. do this not user friendly

The roll pin on the synchro fork has broken it's not allowing the collar to disengage or the brass synchro ring has spun

I assume it's a manual transmission.
If the car will not roll backward or forward in neutral (with or without the clutch engaged) the transmission is most likely locked in two gears at the same time.
This may happen if gear selectors are excessively worn. If you are able to examine the gear selection levers external to the gearbox, ensure they are in the 'neutral' (no gear selected) position when the gear lever is in Neutral. If not in correct position, you may be able to manually reset the levers to correct neutral position and thereby unlock the gearbox.
In any case, if it's happened once, it will happen again, so get the gearbox and gear selection mechanism checked for wear or breakage.