argdo does not execute macro on all args files

Dear Vimmers,

I just had a surprising experience with Vim's argdo command.

I did the following:
1) In my ruby on rails project I opened Vim and set the argument list with
:args `find . -name '*.rb'`
After this, I could see, that all Ruby files in the project were in
the argument list
2) I recorded a macro to add a simple comment line at the top of the file
ggO# encoding: utf-8^[
3) I executed this macro on all files in the argument list:
:argdo :norm @q

Interestingly only a subset of the files in the argument list got
changed, others were untouched.
In fact it only affected the files in a certain sub-directory.

Does anyone have a clue why this happened?

I am using (precompiled) MacVim 7.3 which is the latest available version.

Your help will be much appreciated.

Kind regards!

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