Ryan on the C3D Shapeoko board made the following post about the compatibility of the new Shapeoko S5Pro and gSender. I don’t have an S5Pro so I can’t test why it doesn’t work with gSender.
I wouldn’t mind providing him with corrective instructions on a Sienci Labs fix.
PS. This sounds like a job for @NeilFerreri ! 
@CrookedWoodTex Since you did ask, Tex, I changed your post to “suggestion”. 
In the link that you provided, I saw that the poster showed a solution to his problem. However, he also said that he really wanted a web-based solution, which at least right now, does not describe gSender.
Well, yeah, but I’m not sure what the problem is with the S5. It’s only a guess to me based on what he posted.