When using photoshop I sometimes come up with this issue:
A random black shape will appear on my file and then the whole file will mess up. Even if I revert back to previous save (which was previously fine) there are lots of black squares on the file, the file has sometimes been flattened and there are also squares missing from the artwork. Any idea what causes this? Image below:
Mavericks OS? Many posts of issue.
This looks like the ongoing file corruption problem that is usually attributed to gaussian blur. I've had it several times on different macs and OS versions. Its VERY BAD. And I don't think anyone's got a solution (other than back up frequently).