Doesn't preserve Execute Permissions on sync

I keep a bunch of shell scripts in a ~/bin directory. I sync it accrosss my computers but I have to set back execute permissions on new/changed files everytime those sync.

Anoying..

ProblemType: Bug
DistroRelease: Ubuntu 12.04
Package: ubuntuone-client 2.99.90-0ubuntu1
ProcVersionSignature: Ubuntu 3.2.0-19.30-generic 3.2.11
Uname: Linux 3.2.0-19-generic x86_64
NonfreeKernelModules: nvidia
ApportVersion: 1.94.1-0ubuntu2
Architecture: amd64
Date: Tue Mar 20 15:09:29 2012
EcryptfsInUse: Yes
InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Alpha amd64 (20120316)
PackageArchitecture: all
ProcEnviron:
 TERM=xterm
 PATH=(custom, user)
 LANG=fr_FR.UTF-8
 SHELL=/bin/bash
SourcePackage: ubuntuone-client
UpgradeStatus: No upgrade log present (probably fresh install)