Marlin RC6 Not Booting/Communicating

Running a Printrboard Rev.D, just meticulously went through configuration.h
Uploaded it to the board and that was successful

But it either appears to not be booting, or not communicating
None of the host software that I've tried (Repetier. Octoprint) can connect to it.

Appears to be only an issue with Marlin RC6, I can upload Repetier Firmware as well as the latest stable Marlin 1.0.2-1 and it's fine.
I've posted it as an issue on the Github and no response, wondering if anyone else has seen this or has a suggestion

How did you get the PrintRboard to compile with the Arduino v. 1.6.9 ???? Do you have the files it takes to let Arduino v. 1.6.9 compile and load a PrintRboard?

I did 2 things.

1. I flashed the HID bootloader (included in package below, you need to use the icsp header on the Printrboard and an ISP programmer (I used an Arduino Mega 2560 I had from a RAMPS setup)
2. Installed Arduino 1.6.8 and used the package from here: https://github.com/scwimbush/Printrboard-HID-Arduino-IDE-Support

Flash of Marlin from Arduino IDE only works on Windows with that package, the binary for the uploader isn't there for MAC

Edited 1 time(s). Last edit at 07/04/2016 05:27PM by FA-MAS.

I tried Marlin RC1 through RC6 and RC1 was the only one that worked.
I ended up with the current stable release 1.0.2-1 but it kept giving me serial disconnects.
Flashed back to my original version.

Figured it out and created pull request #4345 but it hasn't been merged.

I have a fork with the necessary changes.
https://github.com/darrelhunt/Marlin

Quote
FA-MAS
Figured it out and created pull request #4345 but it hasn't been merged.

I have a fork with the necessary changes.
https://github.com/darrelhunt/Marlin

That Pull Request doesn't seem to exist. Can you double check you have that correct?

It links directly to it when I click.

Edit: That's interesting, it doesn't show up when I've logged out, wonder if that's why no one's commented or not been merged.

Edited 1 time(s). Last edit at 07/22/2016 05:09PM by FA-MAS.

Looks like github disabled my profile thinking I wasn't human, seem to have gotten that resolved and it should show up now.