This is with IntelliJ 10.0.2 on Ubuntu.
I am trying to track down a problem one of my workmates just experienced. This afternoon, after doing we don't know what, inspections were no longer running and errors were no longer being shown either in the editor pane (red highlighting) or in the gutter. We checked and the inspections seemed to still be enabled, and we saw no checkbox or control which might have disabled them. He disabled, then removed, two third-party plugins he had added, but even after restarting that didn't help.
He then renamed his ~/.IntelliJIdea10 directory and allowed a new one to be created from scratch. He did this twice. The first time he re-imported settings he was using before, and the problem still appeared. The second time he did not re-import his settings, and inspections were back.
We are trying to figure out if this is a bug or a setting/checkbox we don't know about. He has his old settings directory backed up in case you want us to root around for a particular file.
Thanks in advance,