Running latest DEV build of MEK with latest build of AOBD on curse. Don't know which mod is causing the crash ,but as soon as I click on the creative tab in vanilla minecraft to search for a item I get a freeze for a minute then it crashes . Crash log here http://pastebin.com/tRk6FTXk and I posted this over on the AOBD GitHub as well here buttilda/Another-One-Bites-the-Dust#69

It was AOBD's fault and it's been fixed for a couple of versions.