Weirdest thing. since the update some of my dlc isnt showing up. Kryptonite and the first blink 182 pack. anyone experince something similar?

I am no expert on this, someone else with greater knowledge probably will be of more help, however until help does arrive and assuming that you have probably already done this;

First I would check to see if within Steam, those particular songs / packs are enabled. Before doing that maybe see if the .psarc files are already actually in your dlc folder (i.e. C:\Program Files (x86)\Steam\steamapps\common\Rocksmith2014\dlc).

If they are already in that folder, they maybe damaged. Deleting Kryptonite and the Blink 182 files and reinstalling them via Steam won't hurt anything.

Side note and unrelated, adjusting the difficulty on Kryptonite always crashes Rocksmith on my machine.