Can't access my tablet's data

hi,

I am using MBP (Mac book pro) and my shield tablet, I used to be able to access all it's data and SD card data via Android File Transfer but now after I installed new kernels and custom roms (like bliss 3.9) I can't access it anymore, my computer doesn't reconize it..... it drives me crazy :(

The problem is that I don't remember when was the last time it worked so I don't know what may have caused this...

Here are my details:
Bliss version 3.9
Kernel version: 3.10.33-TeamBliss-g48f7329-dirty
if anyone has an idea how to fix this, or what can be the problem I would love your help.

thank you!