Originally Posted by RealBmw 02
If it goes into fith and then pops out I don't think it is a syncro issue. Even with bad syncros you can get into gear, there will just be some grinding issues.
Not always. That's a typical and the most common problem with the synchromesh system, but not the only one. Sometimes the balk rings don't allow the shaft collar to fully lock into gear, causing it to disengage and go back to its detent position, in between gears, as was the case with my friend's Jetta. In the end, he destroyed the gearbox by keeping it forced in with the shifter, but it got him home to Jersey from Ohio.
But I agree that I may have jumped the gun on my first reply; it could indeed be a sloppy shifter issue. If so, it could be the seat bushing; the big plastic ring at the bottom of the 'stick'.