Foam in Crankcase

[Nelsonmd]

Here's the background: I changed the oil at the beginning of winter figuring I would put the bike away, but due to the really mild winter, I rode it on and off the whole season (it sat for about 2 months at one point). So I have been riding it a little bit the last couple weeks, and today I went to change the oil, and after ridign it a short bit this morning, I saw this in the oil window:


And this under the cap:


I put a little seafoam in there and went for a short ride to mix it in, then changed the oil. Afterwards, I found this:




Anyone know why this is happening and if it's a sign of a problem? The oil I changed out didn't look bad at all, still amber color, maybe a little bit cloudy. For reference, I am using Castrol 4T oil 20W-50 http://www.autozone.com/autozone/access ... 93839_0_0_