[kingofspain]

Perhaps because I deal with it much less than the other stuff, but SSL. Getting it set up, being tied to one IP (until all older browsers have died) and to a lesser extent the fact that "trustworthy" certs still cost so much and the racket with greening.

Other than that overflow on iframes in Chrome (big hassle today!), SOAP(!!) and the general lack of a decent editor/IDE that doesn't have at least one infuriating feature.