As we don't have any similar issue reported, would you please save and send us the minidump
file of the crash to firstname.lastname@example.org? (You can get the minidump clicking "View report details->View report contents", checking the path of the "3dsmax_minidump.dmp" file and making a copy of it, before closing the 3ds Max Error Report window).
Could you please specify used Forest Pack and your renderer versions?
Also please double check you have the latest Autodesk 3ds Max Design 2012 Product Update 12
applied. Thanks in advance.