ok, I'm working my way through a fix - I'll let you guys know where I am in case you're like me and you have tight deadlines to meet.
Make a copy of your playmaker globals file (Assets/Playmaker/Resources) - preferably from GIT pre 5.6 update.
So go to your playmaker globals file, and click on the 'playmakerglobals' (Assets/Playmaker/Resources) script in the inspector. It should show you which script the globals object is using in your project window. In my case it was pointing to the Playmaker.dll in Plugins/Playmaker/WP8 - obviously the wrong one! Set it to the right one in Plugins/Playmaker.
Then finally, if your globals object hasn't updated, open the asset in a text editor like sublimetext, open your backed up copy, and copy/paste all the variables at the end of it into the current file.