Wouldn't it be better to base the release of a clean check out to a temp directory, so you're 100% certain it contains what's in the repo and nothing else?
I agree. Additionally, I would do a svn copy
When using cvs it could look like this:
mkdir -p /tmp/$REV
cvs export -r $REV MyApp
tar -cvf $REV.tar MyApp
rm -rf MyApp
I guess a similar thing is possible for subversion also.
No matter how great and destructive your problems may seem now, remember, you've probably only seen the tip of them.