I just upgraded to 5.1 for Unity. I now get a bunch of errors when compiling the 2D toolkit. Errors like this:
Error 253 The type or namespace name 'tk2dUIManager' could not be found (are you missing a using directive or an assembly reference?)
There are well over 350 errors so it looks like most of the classes are just not being compiled.
In particular an error like this caught my eye in this line:
allTransforms = (from t in allTransforms where t != batcher.transform select t).ToArray();
The error is:
Delegate 'System.Func<UnityEngine.Transform,int,bool>' does not take 1 arguments