I noticed in my test game yesterday as Germany, that I suddenly had quite a lot of 'sudden' dissent without any warning or popup. Just out of the blue, I had 1, 2 or 3% dissent without changing minister or any other event. I suspect it was probably some country who used a spy op on me, but it seems strange to me that I didn't receive any notification about it. I checked all the message settings, and they were all on popup.
It is probably because of enemy spying. I'll investigate why there wasn't a message.
Also: What are the maximum levels of intelligence? I seem to be capped at 95% counterintelligence (currently at spy level 15). I assume this is WAD, since there is always this slight chance of an op succeeding.
Both intelligence and counter intelligence are capped at 100%. Dismal Enigma Intelligence minister gives +5% which are required to reach full 100% (assuming that policy, spy levels and technologies are already maxed-out).
I was also able to practically try to steal a blue print non-stop from France, due to the ridiculously low cost of trying to steal one. I believe it was around 25 gold per attempt, while my monetary income was around +7.
Spy missions cost is one of the things in the new spy system that is not fully balanced yet. I assume you have +7$ daily as Germany because of trading for money with the AI (in my last test game without extra money trading I have about +2 to +3 money daily during peace time and negative income in war with high spy level). I personally would call money trading a bit exploitive against the AI and unnecessary micromanagement, so the current cost setup reflects this point of view. 
Our goal was to give human played countries enough money to wage their own spy "wars" against countries in their range - minors to be able to spy on neighboring minors, majors to be able to spy other majors and rich majors (like USA) to be able to spy all over the world once their spy network is fully developed. Because of that base cost is a bit low, but extensive money trading is not vital for the players unless they want to spend time and resources to do it. To balance this out we increased time between missions to 15 days (from 8 in 1.2) and reduced chances a bit, but as I said this part of the system is not fully balanced yet and this is the main reason for us to release this public beta - to get more opinions from you based on your game experience with various countries.