On 4.10.3 I did a small work around so that it updates when it compiles, seems to work well when I change a public variable in editor view.
In the construction script promote the text render component to a local variable and set it to the text render component. Then set the text on your local variable to what you want in my case “TempRequiredPowerRatingStr” is a public variable that I edit in the editor view port via the actor’s details.
Then finally set your text render component to your local variable.
Hopefully this solutions works for other people and not just me 
