MPG thinks that Apple code quality and quality assurance in OS X are both in a downtrend (and apparently accelerating), but it’s particularly worrisome when software is whacked at the kext level.
According to Tim Standing of SoftRAID, OS Yosemite installation corrupts SoftRAID by writing over a more current driver (version 5.0.3 is written over version 5.0.4, a bug report has been filed). No harm done, but run the SoftRAID app to update the driver back to the most recent version.
Once our customers started upgrading to the latest version of Yosemite, 10.10.1, some of them started having problems. Their SoftRAID volumes would no longer appear on the desktop. We started investigating this after today.
After repeating the upgrade process from 10.10 to 10.10.1 ten times in our lab, we found that Apple's update software modifies the SoftRAID driver about half the time. Once the SoftRAID driver gets modified, the Yosemite system software will no longer load it. This leaves customers wondering what went wrong.
The solution is to use the SoftRAID application to reinstall the SoftRAID driver.