The usual reason for game crashes is that the video card runs out of memory. Setting the graphics to "poor" is a good start to diagnosing, but since that didn't help, the next step is to make sure no special settings are causing the problem. Next time you're logging in to Kur, hold down the CTRL key on your keyboard. The login button will change from "Enter World" to "Enter World FORCE LOW-RES". This turns off all overrides and uses "-2: Retro-Terrible" graphics settings.

If you still crash, then we can rule out the usual causes and the next step would be to email me the output log from your crash so I can see if I can spot a problem. But usually the next step is more annoying: it will work fine in that extreme low-res mode, but when you raise it up again it'll crash. In that case I would turn off all graphics overrides (and if that doesn't help, perhaps even delete the local config file) to see if that fixes it. Changing something like View Distance can make a big difference to graphics memory used.

There were no changes (that I can think of) to Kur in the last patch. Did you your video driver update very recently? That could also be a culprit.