Location Based Opacity- issue w/ Set Vector Parameter Value

I am a newbie, and have been trying to get location based opacity working in my project for about 20 hours now so I figured now would be a good time to come to the forum for help.

I have followed the two tutorials below twice with the same results.

Location Based Opacity in UE4 - Part1

Location Based Opacity in UE4 - Part2

I have everything working perfect from Part 1, but then in part two the vector parameter that provides the location for the sphere mask that drives the opacity mask is not being updated by my blueprint that is supposed to “Set Vector Parameter Value” based on my Actor Location. No matter what I do, the “Get Actor Location” function will not update the"Set Vector Parameter Value".

Below are the screenshots of my setup. Please let me know if there is any additional information I can provide and thank you in advance for your help!

Related Error found in the Output log:
PIE:Warning: Warning SetVectorParameterValue called on TryAgain with invalid ParameterName ‘None’. This is likely due to a Blueprint error.

When I upgraded from 4.5.0 to 4.5.1 it all of a sudden worked! So this appears to have just been a bug in the engine.