(Indexing was taking place in the background while I was using Logos, due to having just downloaded a couple of new resources.)
I selected some text in a resource, right clicked on the selection, chose "Add a note to (note file name)" and started typing some text.
Nothing I typed had showed up yet, and Logos was displaying the "Not responding" message in the title bar, so I hovered over the Indexing icon to see where it was in the process. It had one minute left. I waited until it finished and the icon disappeared, and Logos was still hung, out to lunch. It never came back from recess.
Log file attached: 7266.Hang20110115.zip