crash with snapshot & 1.5.1 when smoothing

[quadf]

I've noticed that Wings3d crashes quite easily and quickly when smoothing objects.

This is how I can reproduce it every single time:
1. add a cube
2. go into body mode
3. select the cube
4. smooth it a few times
This can take 1-6 smooth operations before it crashes. Sometimes it only takes 1-3 for the cube.

I can always reproduce this.

OS: Windows 7 64
hardware: nvidia GPU,
wings3d: wings3d 64 1.5.1 & snapshot

Please let me know if I can obtain debugging information somehow.

edit: It looks like enabling and disabling quick smoothed preview fixes the issue until the program is restarted.