This problem occurs under Debian (Wheezy).
ExcludeListISO-w61-x86.txt and others have wildcards like:
*/w60/*
This is supposed to exclude the whole directory w60, under client. However when ISO is generated the w60 directory has been included.
Now, since the "w60" part of the path is the whole directory name, the above should be replaced with:
w60
This causes any file or directory called w60 to be excluded, which is what we want.
*w60* also works, but the wildcards are not required, and may unintentionally match other stuff.