That is very strange. Can't say I have seen that before. Have you tried renaming (suggest) or deleting your Normal.mxt (C:\Documents and Settings\[User Name]\Application Data\ESRI\Desktop10.0\ArcMap\Templates)? Sometimes that will help with problems like this.I hope this helps.Cory
I'm also having students who randomly experience this. Still no suggestions?
I've had this happen sporadically for years. The only solutions I've ever found were: 1. as suggested, close the project and re-open it, or (if that is a pain) 2. just use the folder folder icons for the duration of that project session.
I raised this with ESRI UK support, who had no idea so took it to ESRI Inc., and the verdict was "we have no idea, let us know if you pin it down." Surely someone, at some time, must have designed this view?!
The best I can do is that it's possibly some sort of fumbled keyboard shortcut, and might happen around the operation of saving to a .lyr file. But I'm working with novice students and they haven't been able to tell me any more than that (nor do they have time to keep trying again and troubleshoot it for me).
Another ArcGIS mystery...
Also strangely just encountered this issue (ArcMap 10.6.1).
Retrieving data ...