Make vim's YouCompleteMe plugin recognize exuberant-ctags

I've been trying for hours to get the YouCompleteMe plugin for vim to recognize my exuberant ctags. Everything else in YouCompleteMe appears to be working, like autocompleting functions from headers and such. I really want it to default to tag files. Below I've listed my .vimrc a test tags file which is located at ~/.vim/tags/

This is my testtags file

!_TAG_FILE_FORMAT   2   /extended format; --format=1 will not append ;" to lines/
!_TAG_FILE_SORTED   1   /0=unsorted, 1=sorted, 2=foldcase/
!_TAG_PROGRAM_AUTHOR    Darren Hiebert  /dhiebert@users.sourceforge.net/
!_TAG_PROGRAM_NAME  Exuberant Ctags //
!_TAG_PROGRAM_URL   http://ctags.sourceforge.net    /official site/
!_TAG_PROGRAM_VERSION   5.9~svn20110310 //
myfunc  test.h  /^void myfunc(int a, int b);$/;"    p   language:C++

The testtags file was generated with the command ctags -R --sort=1 --fields=+l --c++-kinds=+p -f testtags test.h

and my .vimrc file here

syntax on
filetype off

set runtimepath+=~/.vim/bundle/vundle/
call vundle#rc()

Bundle 'gmarik/vundle'
Bundle 'Valloric/YouCompleteMe'

let g:ycm_collect_identifiers_from_tags_files = 1
set tags+=~/.vim/tags/testtags

filetype plugin indent on

The output of entering the vim command :echo tagfiles() is ['/home/jodag/.vim/tags/testtags'] and the command :set filetype? is filetype=cpp. This means that YCM is finding the tag files and recognizing that I'm currently editing a c++ source file but it won't show the myfunc completion when it press Ctrl+Space. Any help in figuring out why this is happening would be greatly appreciated!

Solution

So I figured out the solution after posting on the YCM issue tracker. Apparently the tags file is only read when ctrl+space isn't pressed.