OK, worked it out I think.
hMod uses it's own server jar file (minecraft_servero.jar, fact fans!) which obviously hasn't been updated when i updated the official server file.
I've just launched the original server jar, and it's currently converting the world to the new format. I suspect this will take FOREVER, and there is a back up if it goes wrong or whatever. That means no hMod until hMod is updated.
Alternative is we hold back and use 1.2 client and server until hMod is up and running with the new server. I don't mind which, but let me know what you'd all prefer (I think I know what that will be somehow :D).
On the plus side, the 1.3 client is /much/ faster than the 1.2 was for me - on Singleplayer I can have fancy graphics on my laptop, view set to normal and still got 40+FPS. The new lighting is pretty, too.
New server, or new map?
Edit: I know, we've had this conversation before. I just like to check.
we need to decide /now/ before we do any work, as I can't convert the new world format back to the old to work with 1.2.
I am going to have a shower, and then I'll decide what to do. I'm edging towards keeping 1.2 for now tbh.
Aye. 1.2 for now, will decide over the next couple of days whether to move based on noises from hMod, kMod,Bukkit etc.
Restoring 1.2 now, should be up in a few.
Can someone find a download for the 1.2 client and share a link pls? :$
Added.
Server is now back up, on 1.2.
You need to have the 1.2 client to log in. If you haven't already updated to 1.3 this should just be a case of using the new launcher and NOT UPDATING TO 1.3 when it asks you.
If you have already upgraded, you need to find the old 1.2 version of Minecraft, and launch it with the new launcher and NOT UPDATE!
I think I have 1.2 on my PC actually, lemme check.
Right, to play 1.2 if you've updated, I /think/ this is what you need to do:
Go to %appdata%/.minecraft and delete or rename the BIN folder.
Then replace it with the BIN folder you can find zipped all up nice and warm here: http://minemap.tehforum.co.uk/bin.rar
Then launch via the new launcher and choose no to update (if you can log in, I still can't log in via the new launcher.).
I'm off out now, so any problems are your own :C