no syntax coloring at session startup

I tried a lot of things during the last months, but I still do not
have syntax coloring at session startup.

The only filetype detected at session startup = TXT
No html, php, vim or _vimrc file detection.
I have to do ":tabdo e" to reload all buffers to have syntax coloring.

I have this in my _vimrc
filetype on
filetype plugin on

This is my sessions info in _vimrc:
set
sessionoptions=buffers,curdir,folds,help,resize,winpos,winsize,tabpages
au VimEnter * exe "so $VIM\\vimfiles\\sessions\\Session.vim"
au VimLeave * call MakeSession()

When I load a single file syntax coloring is working fine.

What can be the problem?

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