I've tried both 0.1.5.1 (from the Curse launcher) and the 1.4HOTFIX (from ATLauncher) servers, and neither will allow me to connect with their associated client. I keep getting a version mismatch from the server; it's asking for 1.8.7 when the client-side packs and server packs I've been using clearly state they're 1.7.10.