A client crash generally means a graphical/client-side problem. If it was a problem in the emulator, it would cause your server(s) to crash.
Since this is the case with new accounts too, there are a few options....
1) Your spawn map is a custom map (with textures/models) that's missing in your data folder/grf.
2) Your spawn map has custom monsters in view that are missing in your data folder/grf.
3) Your spawn map has a NPC sprite in view that's missing in your data folder/grf.
That said I hope you can trace down the problem, good luck!