Enrichment Chamber refuses to take any form of input from chests, hoppers etc. I think this is due to some problems mentioned here on Github earlier about integration problems with AE2, bacause when I tried to upgrade my Enrichment Chamber to a factory (to hopefully remove the bug) the game crashed as i pulled the factory out of the crafting table, see crash-log:

http://pastebin.com/nRGvDqTi

After doing a bit of code-digging, there is no way that this error could occur in a situation other than a transition issue. Breaking and placing the block may fix the issue.