Ok,
I can testify that all is working very well on both unity 3.5 and unity 4. One thing to look at:
it looks to me that you are out of synch with the demo. Make sure you always download the photon samples from the hutongs, when you update playmaker, they go together, a previous sample package WILL NOT WORK with a new playmaker update, Photon network plugins evolves very quickly, and we try to follow and be on par with the one you can get manually from the asset store. Also we improve the demos and internal scripts as well, so it's always mandatory to make sure you have everything up to date.
-- also, you should not mix previous builds with new builds, for example, if you have published this demo a while ago and now play from the editor and run that old app you may experience issues, and compatibiliy problem simply because for one, the player prefab is different. So at least for this demo this is not recommanded.
Keep me updated, if you still have problems, maybe I will set up a gotomeeting with you to get to the bottom of this issue, cause I can't replicated this, only if I start messing with versionning, which is of course breaking everything.
bye,
Jean