Quoted from a post by Simballer and edited a tiny bit:
Hi folks,
We are investigating reports of users seeing invisible players, primarily on the PC version of the game. If you are experiencing this, the following MAY help to resolve the issue:
1) Navigate to your NBA 2K16 userdata folder in C:\Program Files (x86)\Steam\userdata\xxxxxxxx\370240\local (where 'xxxxxxxx' is an 8 digit random number).
2) Delete your SYNC.BIN file.
3) If you are running an anti-virus scanning program, ensure that your "local' folder in step 1 above has been whitelisted (or you can disable it entirely at your own risk). The game's folder under "C:\Program Files (x86)\Steam\steamapps\common\NBA 2K16" should be whitelisted as well.
4) Reboot the game and allow it to idle for some time as updates are re-downloaded; don't dismiss the dialog (this may take some time if the connection between our servers and you is not optimal).
In addition to the invisible players, if you are seeing a crash a very specific point in the game (such as on boot), this MAY help you as well.
If you are still seeing invisible players after performing the following steps, please reach out to customer service.