After the latest 4.3.3f1 update on Mavericks freezing is back and even worse than before. Mac freezes for 2-3 minutes. Please fix this! Freezing occurs mostly when I select objects in scene or change active windows of editor.

@QA FOR LIFE, Thomas Petersen,

Is the OpenGL ARB VBO leak the cause of the Unity seizures issue and the app switching issues? Is this a blanket cause to the many problems described across this thread?

Most of the iOS developers working with Unity cannot "not use" Mavericks. It's required for publishing against the iOS 7 SDK. An unfortunate and stressful position to be in.

Most of the time I can work fine with Unity using Maverick, but I do experience this: http://forum.unity3d.com/threads/217648-Using-Terrain-Engine-Unity-becomes-slow-drags-system-down

Yes! OS X 10.9.2beta is notice about OpenGL driver! But before the final version and... latest Mac Pro ;) release, try this workaround prevent freezing on app switching:

Add a new tap("Profiler" or "Animation") to your "Main Editor Windows".(don't go full screen but you can select "Maximize on Play" if you want)

Before "PLAY/STOP" your game - Switch/change "Game" or "Scene" tap to other tap.(not closing tap)

Note : only "Main Editor Windows" will automatic switching tap while hitting play/stop.

Macmini5,2 (Mid 2011) Radeon HD 6630 OpenGL 4.1, OpenCL 1.2 (OS X 10.9, Unity 4.3.3).
Unity "quality setting" : > beautiful(shadow is on).

Thank you for following up RDM.BOIS. I really appreciate it. Yeah, sounds like my issue is a little different... I've got the periodic (every 3 to 5 minutes) editor lock-up during general use (doesn't really matter what I am doing in Unity), and lock up on app switching... I've tried disabling app nap, hiding the game tab etc. but nothing solves it. Hoping for a fix soon. Completely unusable.

ILPRESIDENTE, from our developer: "You can tell him that, yes, all I did was close the game tab before publishing." It sounds like the problem you're having may be more complex than this, but I hope it helps.

IlPRESIDENTE. I will ask my developer for more insight and post back.
RDM.BOIS.

@ RDM.BOIS

Can you clarify the workaround, I'm not sure I understand? Are you simply hiding the "Game" tab before hitting play/pause? Is this stabilizing the editor's periodic freezing, and/or freeze on app switching, or just a fix for freeze on game playback? I've tried keeping the game tab closed/out of focus and its not helping. Sorry, confused and desperate over here.

We have tried HENRYBOON's suggestion (Post: Jan 16, 2014 16:10) on this problem and it has made a substantial difference. Where before Unity was crashing within the browser (Chrome and Safari) within seconds of start, it is now much more stable ... running our application for > 5 hrs before crashing.

We're not yet out of the woods in that when first starting the app it has still crashed within seconds, but it then seems to stabilize - three times a charm. Thank you Henry.

I hope Unity and Apple work aggressively to resolve this issue though. We and our members have to be able to rely on the application - the Mac market is an important one for us.

Thank you, HENRYBOON. I'll pass it on to our development team and report back.