And more bugs!

The new system has a couple issues, not the least of which is the possibility of affecting other dimensions. Undesirable, but the Forge PR I pushed will fix this, once it goes through. The biggest issue is that the biome was registered to the array before it was fully constructed, meaning the reference was “leaked” and used before the object was fully valid. Bad stuff.
I fixed what I could for this, but the possibility of some quirkiness is still there.
I also fixed the server side crash caused by my changing some of my weather code. I moved from an internal system to using a bit of vanilla code, and I failed to note that the function I used was client side only (because half the weather model on Minecraft is client side only?).
I also handled an issue with asynchronous access to the world referencing ages still being constructed. This has been a long standing issue, and I think I finally zapped it.

Again, if you find any issues be sure to bring it up on the Mystcraft Forums.

To recap: there is only one download (found at the bottom of this post); This file is the universal install for client and server; it no longer goes in the jar.
Mystcraft goes in the mods folder.

If you are still lost on the 0.10 series, check out Direwolf20′s Mod Spotlight! Direwolf20′s Mod Spotlight for
If you are having trouble with writing, check out Direwolf20′s Writing tutorial!
Note that there are a couple changes between the video and the current mod, particularly that colors and things are easier to write. If you follow the tutorial, you’ll do great.

Download: [1.6.4] Mystcraft Universal Link
Download: [1.6.4] Mystcraft API Link
Check the Mystcraft Forums for updates and the change log.