Was it having problems recognizing the MTP USB Device?
I honestly don't know...im kinda new to all of this so I am having to learn as I go. When I would plug in my cable to the PC it would just do nothing...the phone wasn't showing up in device manager and nothing on the phone indicated it was connected to the PC except it would charge the battery. I am not sure where the "disconnect" was between Rubix versions 1.8.6 and 1.8.9 but it seems that once I got the PC to recognize the phone, it started working in all of my backups (themed or naked) including the one I made just before trying this. I have I was really at my wits end and was figuring I was gonna have to learn to SBF because I accidentally deleted my stock 2.2 backup. I am so glad this worked because I was doubting that RSD would recognize the phone to even allow me to SBF.
I hope you get yours to work and I wish I could offer more technical advice but all I got is alot of trial and error