I also have this problem with my multiseat setup and 1.1.0 final.
I'm trying to figure out the UNC path workaround and there is one thing I don't quite understand:
I have two floppydtv-dvbc cards in my dedicated tv server and each card is mapped to two different timeshift folders on two different drives. Do this workaround require a shared timeshift-folder shared as \\TVSERVER\Timeshift (for example)?
You have to use one timeshift folder for all cards with this workaround