[OS X TeX] Can't write on file xxx.aux

[Alain Schremmer]

I have a problem which I don't understand.

I am normally working with TeXShop 1.43 on a Dual 1 GHz PowerPC G4 under 
10.3.9 and, in order to work on the book while away for a few days, not 
knowing which file was calling which file, I copy everything—including 
the style sheets—onto my 400 MHz PowerPC G3 also running under 10.3.9

Last time I used this approach, a few moths ago, it worked perfectly.

Yet, this time, when I try to typeset a file xxx, I get "I can't write 
on file xxx.aux", no matter what xxx.

Do I really have to reinstall everything on the PowerBook? Or what am I 
doing that is so stupid I can't even see it.

Hopeful regards
--schremmer
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