This one is still unfolding, but wow.

Variety:

Film and TV editors across Los Angeles were sweating Monday evening as their workstations were refusing to reboot, resulting in speculations about a possible computer virus attack. Social media reports suggested that the issue was widespread among users of Mac Pro computers running older versions of Apple’s operating system as well as AVID’s Media Composer software.

This is astonishing. Not just one or two Mac Pros, but a bunch of them, all refusing to reboot.

Some analysis by affected users seemed to suggest that the outage may not have been caused by a virus, but by a recent software update that may have corrupted some data, with some suggesting a OS X reinstall that keeps the existing data to restart the machine. Either way, it’s a good idea for anyone running AVID software on a Mac to back up all data right away.

Note that these are the trash can Mac Pros, not a secret rollout of the not yet released Mac Pros announced at WWDC.