Emacs : GNU Emacs 24.3.1 (x86_64-apple-darwin, NS apple-appkit-1038.36)
Package: Org-mode version 8.2.4 (8.2.4-3-g7fe99a-elpa @ /Users/drorata/.emacs.d/elpa/org-plus-contrib-20140217/)
Line #463 in org-mobile.el is:
((eq (car x) :grouptags) nil)
which should be the fix. I could fix the issue by moving this line after the following one, have:
((eq (car x) :newline) nil)
((eq (car x) :grouptags) nil)
for lines #463-464 instead of
((eq (car x) :grouptags) nil)
((eq (car x) :newline) nil)
which is the current state.