Ok, looks like orang needs to be rebuilt against 4.10.
Just started testing the apps, (Orage, midori, xfburn, etc.)
For my testing Orang works as a stand alone app in xfce4-4.10 but see not it does not work from the panel, when it is choosen as plugin.
Agree with you though. It is my preferred panel clock, as well. See if I can get it going.
There is still a bit of work to be done on xfce4-4.10. Not even the folks at xfce.org have got all there apps and plugins tested against the new xfce-4.10. In some cases we have had to come up with our own patches to get them working.
Thanks for testing and letting us know what needs to be worked on.