[russncraig]

I'm having the same problem with 1.6.1 (v143.16). Seems to happen when i have made many adjustments to various tasks, switching between Task and Resource views. Will send a sample file.

I should mention that when i get this error, my machine is totally hosed. OmniPlan hangs, other apps hang, no force quit, OS cannot quit or restart. Very not pretty. (I will say that the Dock is a trooper, though.)