“Whenever I drag a party member from my party list onto the screen for the on-screen party window, my client crashes.”

This is a known issue with our current client and caused by screen resolutions of aspect ratios other than 4:3. It will likely be resolved in a newer client version some time in the near future.

To fix this, try using a screen resolution in an aspect ratio of 4:3:

Examples are 1024×768, 1280×960, 1600×1200 or 1920×1440.