My last several beers have had particles in the beer. They almost look like hop leafs but I am using pellets. I usually see them in about the first 10-12 beers, the beers are somewhat cloudy. These particles generally sink to the bottom of the glass so they are not affecting the beer. After about the first 10-12 beers out of the keg, the next 20 or so are spot on. Nice and clear with no particles. Then the last 10 or so beers are much stronger and with a more pronounced flavor profile. Here is what I have done with the last 3 or so batches:
Ferment in primary at 68-72 degrees for 1 week
Move to secondary, dry hop, at 68-72 degrees for 1 week
Move to keg, carbonate, at 68-72 degrees for two weeks
Move keg to kegarator, hook up to CO2, at 40 degrees for 1 week.