Ok, So I got this figured out.
The thing is, when boost library was removed two years ago, it removed the ability to navigate on UNC folders too.
I thought that this was really strange since EmulationStation can still loads the gamelist.xml on my Server but couldn't load anything else, but, I found a pre 2.7.4 build (that still has boost library) and now everything works :)
Right now I'm running a really old 2.6.4 build. If anyone here has a 2.7.3 build saved, please share with me, I would really appreciate.
Thanks again