Apple has today released OS X 10.8 Mountain Lion Developer Preview 2 to developers of Mac applications. The company has also posted a list of known issues and bugs with the latest OS.

Known issues include the following:

• 32-bit kernel extensions are not supported in Mountain Lion

AirPlay mirroring is not supported with the with the current version of the Apple TV software Game Center The Game Center Server environment is set to Sandbox. Existing Sandbox accounts may be used, or you may create a new account

In the Sandbox environment:



Game & Friend Recommendations are not supported





Friends can view games in common but not friends’ other games





Photos are not supported





No email vetting and friend requests to un-vetted email addresses are allowed





No support for out of network friend requests is provided





Game matchmaking versioning restrictions are more relaxed



Some of the Game Detail information does not display (Game Provider, Pricing, etc.) in this Developer Preview



Search is not functional



No badges shown for Friend Requests



Peer-to-Peer GameKit API is not supported



Leaderboards, Achievements, or Players may be displayed incorrectly. To resolve this issue quit Game Center and re-launch

The new Notes application does not currently import the following types of notes:

Microsoft Exchange



Notes existing in sub-folders of IMAP accounts



Local notes in an “On My Mac” account Notes in these accounts will be available in Mail Notes shared via Messages may not include note content

Screen Sharing may not work between OS X Mountain Lion and Snow Leopard or earlier OS X releases in this Developer Preview

AppleScript is not fully functional in this Developer Preview

AppleScripts used to launch Applications which are not already open will time out



AppleScripts may not be able to send AppleEvents to Mail

DVD Player may not launch after inserting a DVD on some systems

DVD Movie Playback does not work on certain NVIDIA GPUs

Horizontal metrics for Apple SD Gothic Neo are narrower than in AppleGothic. Applications localized to Korean may experience text layout underflow in multi-line text strings

Video content with displays that use HDCP may experience graphics corruption on certain NVIDIA GPUs

Enabling display rotation causes kernel panic on certain NVIDIA GPUs

Signing into Setup Assistant with your AppleID does not sign you into iCloud

NSDocument-based applications which use auto-save & iCloud entitlements will be opted into the new Document Library automatically. The option to disable this is not currently available

Kernel, kexts, and zones are now based at unpredictable addresses at each boot. The addresses in the kernel symbol table are unslid, and will not accurately reflect a running system. Provided that Xcode 4.4 gdb is used, KASLR is transparent to kernel debugging

To temporarily disable KASLR, set “slide=0” in the boot-args

Panics may occur when a Port Multiplier or PCI eSATA drive is attached

While booted into the Recovery Partition, you may be unable to connect to WiFi networks

Safari does not function in the Recovery Partition

Restoring from network backups in the Recovery Partition may fail

Foor me, the most troublesome part of Mountain Lion has been its new Messages app, which essentially a re-skinned version of iChat that has iMessage support and a few more bells and whistles. It has been incredibly buggy for me in daily use. Here’s hoping that the latest version is just a bit better. It has to get significantly more reliable before Mountain Lion hits the market, that’s for sure.

Developers can download the new release from the Apple Developer Center directly by redeeming a code via the Mac App Store. At this point it does not appear as an update in the store automatically. You can see our rundown of the major new features of Mountain Lion here.

Read next: Tweetbot for iPhone 2.1 goes live with real-time streaming over WiFi and bug fixes