First, it not working perfectly depends if you're working with Apple or Android.
Apple side - Flash is not supported and some application in Chamilo use flash !
Android - It is not easy to read some pdf into the learning path, but flash, generaly, is working. So, on Android, you can install Firefox - Better navigator for Chamilo and the new release seems working fine on Android.
If you want a quick test, go to http://campus.chamilo.org/
- then register and try it, it's free