Here is a few checks I would do.
1. Take a look at your juice bottle. Is the tube that runs inside sitting all the way on the bottom of the bottle. If it is, this can create a seal so that the juice wont come up. If this is the case, you can CAREFULLY slide the cap down the tube slightly, until the tube just barely gets to the bottom of the bottle.
2. Take out the battery and bottle and remove your atty/carto. Clean it up a little bit, then put your mouth over the catch cup portion of the REO and gently blow. You should feel air coming out from the tube. If not then I suspect there would be some type of blockage.
I wouldn't suggest sticking anything in the connection without checking with Rob "Redeyedancer" first. You would hate to damage any seals in there and risk a possible short. If it is a blockage, you may consider a bit stronger blow to see if that clears it, but might risk blowing the tube off.
If it's the tube against the bottom the above should help. If you confirm it's a blockage I would probably PM Rob and ask for suggestions, or maybe another Reonaut will have some advice on blockages.
Good luck. Hope that helped.