Problem with vim spell (Reverese highlight after adding words)

I am having problem with the vim spell. When I add a word to the dictionary and after reopening the file all the words are highlighted in reverse (all the words are highlighted except the 'add' words). Of course the problem is present after loading all plugins. I am asking you if you have faced before the same problem.

Vim 7.4.335
Plugin List:
MacOs

Finished. 0 error(s).
[=================================]

- vim-pandoc-after: OK
- vim-transpose: OK
- vim-table-mode: OK
- vim-pandoc-syntax: OK
- translategoogle.vim: OK
- neomru.vim: OK
- gnupg.vim: OK
- vimproc.vim: OK
- vim-taskwarrior: OK
- perl-support.vim: OK
- vim-airline: OK
- vim-auto-save: OK
- vim-ultimate-colorscheme-utility: OK
- calendar-vim: OK
- colorv.vim: OK
- goyo.vim: OK
- utl.vim: OK
- gundo.vim: OK
- vim-pandoc: OK
- wmgraphviz.vim: OK
- restore_view.vim: OK
- ag.vim: OK
- csv.vim: OK
- vim-colorschemes: OK
- tabular: OK
- Conque-Shell: OK
- VOoM: OK
- riv.vim: OK
- zoomwintab.vim: OK
- syntastic: OK
- unite.vim: OK
- DrawIt: OK
- InstantRst: OK

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