TextEdit quarantines files

After an OS X Lion update which happened this afternoon, TextEdit is suddenly behaving in a strange way.

When I open a bash script with TextEdit and leave the script unchanged, the script still runs normally.

But as soon as I hit any key on the keyboard (even without saving the file), the script cannot be run any

more and, assuming the script's name is kaps, I get this message:

-bash: ./kaps: Operation not permitted

If I issue the command xattr kaps, I get this:

com.apple.TextEncoding

com.apple.quarantine

If I reset the xattr, the file will run again, but as soon as I modify the script with TextEdit, the above

happens again. And this occurs with any script (old or new).

Strangely enough, this seems to affect only files run with the x attribute (chmod +x), because, even

if they are now quarantined, the scripts can be run if sourced (ex: . kaps o r bash ./kaps).

Any idea how to prevent TextEdit from arbitrarily quarantining the files it edits?