I don't know if this interaction is obvious to most people, but it baffled the hell out of me for the first month or so I played. I could never figure out why Dissipation Field worked for my opponent, but if I stole it, it usually didn't work for me. (I had sancs in the deck :p
My initial reaction to how these two cards would have interacted would be that they both just work as normal, i.e. sanc heals 4hp/turn and dissipation field drains quanta to absorb damage as usual. I never even considered that sanc blocked dissipation field from working because they were both on my side of the field.
I finally figured it out when, in (I think) my second tournament, I had a monolight deck with sancs and solar bucklers, and the first turn after having both in play, I got attacked and got no quanta. I sent my opponent an ingame message saying something like 'damn that bug!' and he explained to me how the interaction works.
The other one that still boggles my mind is that sanctuary protects against silence, even though silence doesn't modify hand or quanta. At least that mistake I only made once, since that little game graphic comes up when you try silencing a sanced player.