Problems after 4.15.2

Hello, im having problems after the 4.15.2 update, everything related here are working fine BEFORE the update:

  1. Inputs seems not firing connected things well, like my sprint, its still make change in the characters speed but it doesnt verify the variables, and if i replace all the old nodes for new ones (identically) it wont make anymore changes at the character speed, not even with the input button directly (left shift in this case); this is an example cause i have more things wont working now like my headbobbings and all the things related to branches with variables;
  2. Now im getting an error when trying to open inventory, it says i need an player attached to player controller.

I hope someone could send me a light in this, its the third time i have problems with an update and i dont want to re-do all from scratch AGAIN. T_T

Here’s the error:

Here’s my sprint blueprint:

SOLVED:
I deleted some actors of my scene and all start to work again. Dont know why.