I don’t know what causes this problem but recently I discovered that the “Default web browser” setting in the General preferences tab was blank. Clicking on the drop-down showed no browser names so I could not change the use of Safari as the default browser.
The fix was relatively simple. I opened Chrome and via settings within Chrome I set it to be the default web browser. After completing this action I then had the names of the installed browsers in the “Default web browser” drop-down.
This fix may work using any browser that allows you to set it as the default from within the browser settings itself.
The Short Version: Using gfxCardStatus to manage the graphics mode made a notable difference. Uninstalling McAfee Security made the most difference.
This week I started using a new 15″ MacBook Pro (MacBookPro8,2) with OS X 10.7 (Lion). It wasn’t long before I noticed a dramatic difference between the battery life of the new MacBook Pro and that of my previous 17″ MacBook Pro, which was about two years old.
In the System Preferences I had noticed that I couldn’t configure the system to only use the integrated, low-power graphics card. Rather, I had to choose to enable “Automatic graphics switching” (in “Energy Saver”) or disable it. If it’s disabled then the computer automatically uses the high-performance, battery-draining graphics card.
Last night I began to suspect that the system wasn’t properly switching to the low-powered card. It turns out that I was almost correct.