OK, here are errors in the console. I had 1.772P2 and upgraded to 1.80RC37. This comes from a project that doesn't have much in it. There were 53 errors. I had to delete everything related to playmaker and then reload the project and then install 1.8 RC37 fresh. Then there were no errors. If you need the project I can zip and upload. it's just a demo right now.
Assets/PlayMaker/Actions/SetFsmVariable.cs(98,32): error CS0115: `HutongGames.PlayMaker.Actions.SetFsmVariable.AutoName()' is marked as an override but no suitable method found to override
Assets/PlayMaker/Actions/iTween/iTweenMoveTo.cs(63,38): error CS0115: `HutongGames.PlayMaker.Actions.iTweenMoveTo.OnDrawActionGizmos()' is marked as an override but no suitable method found to override