I am having this same problem. Rules that worked now do not. I moved my rules outside of Dropbox to make sure that didn't have anything to do with it. The main rule I am having issue with is the Move with the date added not within x mins. The same folder has a rule to run an applescript to OCR a PDF. That works great.
As I was typing this, I had a thought and think I have figured it out...I just don't understand why this worked before Yosemite.
My Rules looked like this:
Do OCR
Move
The "Do OCR" would fire automatically, every time but the "Move" rule would never run. I changed the order of the rules to:
Move
Do OCR
Now, the Do OCR fires...and after 1 min (using Move if date added is not within the last 1 min), the Move fires.
Why is the order important now?