I have a weird little dunkelweizen de garde. It has little hops debris from my pelletted dry hop, but still tastes great.
I also had that funky krausen layer on top without any airlock activity. Personally, I was afraid, so I let it sit for a week and let it fall, however, I doubt it was really necessary. I'd guess it's just the yeast attaching themselves to whatever sugars and oxygen is attached to the tiny little pieces of leaves. I doubt it has much effect.
I will say however that I had a really bad medicinal off taste for the first week after bottling. I thought my beer was infected, but it mellowed quite well and is now very tasty.
Hope this helps.
