There was a major bug in WW released last week that has been fixed but unfortunately requires you to take these steps to fix if you have the freezing menus problem:
1) Download the latest WW
2) Open Max and click MAXScript > Run Script and then browse for $scripts\Wallworm.com\install.ms
3) Restart 3ds Max
If those steps do not work, do this:
1) Close 3ds Max
2) Browse to C:\Users\USERNAME\AppData\Local\Autodesk\3dsMax\2015 - 64bit\ENU\usermacros
3) Delete all macroscripts prefixed with "wallworm".
4) Open Max and click MAXScript > Run Script and then browse for $scripts\Wallworm.com\install.ms