vim autocmd silent execution

I have my .vimrc file configured in such a way that each time I save a Python file or enter a python buffer (also for Matlab and Latex but it is all the same) it silently executes exuberant ctags:

set tags+=./tags
autocmd BufWritePost *.py silent !ctags *.py
autocmd BufEnter *.py silent !ctags *.py
autocmd BufWritePost *.m silent !ctags *.m
autocmd BufEnter *.m silent !ctags *.m
autocmd BufWritePost *.tex silent !ctags *.tex
autocmd BufEnter *.tex silent !ctags *.tex

I then sometimes use this information to navigate my files. This works nicely in Mac OS X and Linux. The last month or so, I've had to use Windows 7. When I add these lines to my .vimrc it flashes a cmd prompt in front of me and it is very obnoxious. I also tried !start instead of silent, and that brings a host of other issues, chief among them having to press enter each time after :w.

What am I missing? Is it possible to duplicate my OS X configuration, where the command gets executed, the tags file gets updated, everything gets reloaded without flashing the cmd prompt and without further issues?

Solution

You may want to check

autocmd BufEnter *.tex silent! !start /min ctags *.tex

Alternatively, try /b /wait.