Gross stuff floating near the top of my cider?

[GlimpseTheVoid]

I beseech the wisdom of the brew sages once more:

This batch of cider (my 2nd) taste great. However, I'm noticing something very strange in about half of the bottles. There is a clump of something brown and viscous. I was drinking one while playing video games and that little lump felt like snot

Could this have anything to do with with the spices I've added? This stuff still taste great, but I have to know what this stuff is and how to avoid it on the next go round...

 

[Randzor]

Was this bottle or in carboy? and what did you use to carb?

 

[GlimpseTheVoid]

This occurred in bottling. I carbed with Dark brown sugar, and apple juice concentrate (form the can) . I also added (to much) cinnamon, cloves, and vanilla extract. Don't get me wrong, I love the taste but the spices were a bit to strong for most. I've been able to find a few posts about similar topic and I am wondering if this is connected to poorly dissolved cinnamon and/or spices?

Let me know if a picture would help, as I'll need to grab it from a relatively high shelf to do so...

 

[Randzor]

probably the spices and brown sugar.