How much "slop" does the shift lever have?
I would suggest you remove the shift lever and take a look down inside the tower - if it's similar to the GVs, which I expect it to be, there is a plastic bush which can break and it's possible for a piece to have been left behind (assuming it was replaced) and that can block movement of the lever.
There are actually two plastic pieces which wear & break, the bush I mentioned earlier, which sits between the tip of the shift lever and the extension arm, and a circular seat that the shift lever sits on.

The bush is #6, the seat is #7, you'll end up destroying the boot clamp #27, but it can be replaced with a nylon cable strap.