I can confirm this game hard grash on 32 and 64 bit client. When I stand next to adventure flags and press F to start my game exits with crash dialog. I sent crash reports to arenanet.
Happened on tendril torchers, fallen masks, bugs in the branches, and beetle feast.
Crash report mentions missing textures.
Troubleshooting steps taken:
Update nvidia drivers
Gw2 -repair
32/64 bit client
Set all settings to default.
Cannot start any adventures.