Mac console log entries are not showing up in 10.8 - macos

I have an app writes to the console log. This feature works on 10.5, 10.6, 10.7 and has stopped working in 10.8
Anyone else has noticed this? If so, what has changed and how to overcome it.

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OS X app works in 10.10 and not 10.9.5

I have developed an OS X app using Xcode 6 on OS X 10.10.4. The app runs great in 10.10.4. When I copy and attempt to run in OS X 10.9.5, the app icon appears in the dock but the main window does not show. In addition, only the first menu item is displayed. Activity Monitor shows it running but idle at 0% CPU. There is nothing on the system log and no output written from my app. The app does not crash but sits idle in the dock.
The app settings use OS X 10.8 as the minimum target.
I have not installed Xcode and tried to rebuild as the project file is for Xcode 6, and I would have to downgrade to Xcode 5.x on OS X 10.9.5.
Thoughts on how to solve this? Is there a tool to diagnose this?

Switching Auto layout on results in crashing the application on Mac OSX 10.7.5 only

Application crashes if I switch on "Use Auto Layout" feature for my xib file.
The error on console is:
"Assertion failure in -[NSAutoresizingMaskLayoutConstraint _setSymbolicConstant:constant:], /SourceCache/AppKit/AppKit-1138.51/Layout.subproj/NSLayoutConstraint.m:596".
If I disable this feature the application runs smoothly. I tried [View setTranslatesAutoresizingMaskIntoConstraints:NO] also but same result.
Runs fine on Mountain Lion and on some Lion machines.
OS: Mac OS X Lion 10.7.5(11G56). Could anybody help me to resolve this error.
Thanks in advance.

Xcode 4.6 crash on Mountain Lion

I'm trying to use Xcode but since I'm on OS X Mountain Lion (10.8) it always crashes. If I try to run an app (a new project without anything) with the iOS Simulator it crashes. If I go into settings it crashes.
I've tried removing Xcode (moving to trash), reinstalling it from the Mac App Store, repairing the hard disk...but nothing worked.
Any ideas?
I can copy the log if you need it.
Edit: log http://pastebin.com/rgsYbpQ0
I would try wiping out these two folders after uninstalling:
~/Library/Developer/Xcode/
/Library/Developer/Xcode/

Application is not working on 10.6

I'm currently working on a port of my Windows game for Mac OS X, it runs fine on my Mac when compiled with Xcode 4.5.2 on OS X 10.8, but it crashes on a friends Mac running 10.6. At first I thought it was due to one of the Frameworks I've been using, but the standard Cocoa app template crashes at well, without any visible error message.
I already tried setting the Deployment Target to 10.5, but this doesn't change anything. When starting the App, it appears for a short time in the Dock and then disappears without showing any kind of UI or error message.

Mac App just showing grey screen for Mac OS X 10.7.5

I've just published a new Mac App and it is working correctly on my MacBook which is running OS X 10.8.2. However, I've been getting emails from people saying they only see a blank grey screen when the app launches. All these users are running OS X 10.7.5.
Is there a known issue that would cause something like this. I can't really go into specifics as I don't have a clue what could be causing this to happen or where the problem is.
Thanks

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