I've attached a file that creates a small repo that you can use to reproduce this problem.
If you svnsync only the trunk of this repo, the new repo loses the svn:special and svn:executable properties of files. I ran into this with hgsubversion, but the bug is within svn itself: the delta editor's change_file_prop hook is not called in these instances. Reproduced with 1.6 and 1.7.
addspecial.sh
Description: Bourne shell script
