[OS X TeX] All TeX files are locked!

[David Watson]

On Jul 29, 2009, at 5:42 PM, André Bellaïche wrote:

> Dear all,
>
> I need help for some other trouble. From this afternoon on, I cannot  
> modify a TeX file (TeXShop) any more. When I want to save the file,  
> I get a first message (in French) saying:
>
> The file "F.tex" is locked. Do you want to overwrite it anyway?
>
> When i say "yes", I get a second message, saying:
>
> You do not have permission to save "F.tex" in the directory "so and  
> so".
>
> However, I can save a copy under a new name.
>
> What puzzles me is that happens with all TeX files from different  
> users on my Imac, but not with Excel, Word or Adobe Illustrator files.
>

Are these files in the /Users/Shared folder?
If so, I would suspect "sticky bits".

> Any idea?
>
> André