System specs:
GeForce 8800GTS G92 512MB
Intel Core 2 Quad Q6600
4 GB RAM
Soundblaster X-Fi
Windows 7 Professional 64 bit

A7 Commercial 7.84.2 Public Beta
Intense Pathfinding 3

WED -nx 300 :
Does it compile? Yes
Does it crash? No, works perfectly

SED -nx 200 :
Does it compile? Yes
Does it crash? No, works perfectly

WED -nx 800 :
Does it compile? Yes
Does it crash? No, works perfectly

WED -nx 1024 (!):
Does it compile? Yes
Does it crash? No, works perfectly (!)

Background tasks for all tests: itunes, wed, magix music maker 15, windows live mail, norton antivirus, fiefox, nvidia 3d vision setup driver menu, 3dgs manual x2, steam, rockstar games social club, free download manager, creative console for soundblaster

Just try it with the new public beta, it works fine for me. Maybe they changed something in memory management.

EDIT: You should really use the newest version, Aris: The sys_marker function can be used to indicate memory areas that were overwritten due to a script bug. This can help fixing hard-to-locate bugs that result in random crashes.