A new CraftBukkit Recommended Build (1.6.4-R1.0) that provides Minecraft 1.6.4 compatibility is now available. As this new Recommended Build also contains a CRITICAL security fix, updating is HIGHLY recommended. Notable Changes: Preventing potential structure (stronghold, fortresses, etc.) loss in 1.7 Along with a CRITICAL security fix, Minecraft 1.6.4 also contains a special fix for a problem that could potentially pop up in the future by enabling the saving of generated structures to disk. As such, it is recommended that everyone update to this Recommended Build and explore around the structures you wish to save. For more information on this feature and tips on how to save your structures (as well as a utility you can use to streamline the process), see this announcement. Re-enabling the built-in auto-save We've also re-enabled the built-in auto-save by default to address the issue where newly created servers had no form of saving enabled. As the Minecraft default of 45 seconds is far too frequent and negatively impacts the performance of the server, we've opted to set the default to 5 minutes instead. Furthermore, I'd like to personally apologise for the poor decision we made at the time regarding auto-saving that has resulted in some servers losing their progress on their worlds. For more information on why this decision was made and how we're addressing the problems it has caused, see this commit's message here. Detecting and warning against auto-saving conflicts On top of re-enabling the built in auto-save, we've introduced a mechanism to detect when an auto-save plugin is being used while the built in auto-save feature is also enabled. This is to ensure that server admins are aware that they could be saving far more frequently than they intended to and that it may impact their server's performance. Will plugins break with this build? Provided the developers of the plugins you are using are keeping up with the development of Bukkit, all your plugins should work fine. Known Issues: None. For more detailed information on what is contained in this update, please see the changelog here. Download CraftBukkit 1.6.4-R1.0 here Lastly, I just wanted to apologise for how long it took us to get a Recommended Build out. We were planning to promote an RB immediately after we released our 1.6.4 update but unfortunately we've had issues with our infrastructure that have been preventing us from doing so.