What you were doing when the issue happenedTrying to add a custom search. Nothing happened after couple tries. No pop-up, no form field, nothing. Tried to edit existing custom search - nothing happening either.
Whether you were able to replicate it a second time by performing the same actionYup. Also restarted Alfred couple times with no effect.
Include any screenshots that might help us-
Include the Alfred version & build number you are usingv2.0.4 (199)
Include your OS X version
Wish I could provide any further details.
// edit: reboot didn't help either