I have only one problem since I updated and it has happened 3 times now in the last few days
I will use my MacBookPro and close it (without turning it off) and when I re-open it later on, it immediately gives me that system error where I have to re-start by holding down the power button.
Now, I never had this before but have had it done 3 times since updating.
I have run permissions checks, re-started, powered on/off, etc....but nothing seems to fix it.
That's a kernel panic. Here is Apple's advice for recurring kernel panics. General stuff, but maybe of some help.
Try these suggestions:
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Repair your startup disk, your disk permissions, or both. To do so, start up from your Mac OS X installation disc and use Disk Utility.
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If you have moved or renamed a Mac OS X system file or folder, then you must reinstall Mac OS X. It won’t work to just replace the specific item.
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Disconnect all USB and FireWire devices, except for the Apple keyboard and mouse. Remove third-party hardware upgrades such as random–access memory (RAM), microprocessor upgrade cards, and Peripheral Component Interconnect cards. Then try restarting your computer.
If this resolves the issue, reconnect one device at a time, restarting your computer after reconnecting each one, until you’ve determined which device is causing the problem.
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If the above attempts are unsuccessful, try resetting parameter random-access memory (PRAM). Shut down your computer; then turn it on again and immediately hold down the Command-Option-P-R keys. When you hear the startup sound for the second time, release the keys. Choose Apple menu > System Preferences, and then click Startup Disk. Make sure that the disk containing Mac OS X is selected.
IMPORTANT: Resetting PRAM may change some system settings and preferences. Use System Preferences to restore your settings.