After adding some inner classes to one of the class files in our project I
noticed  a red icon flashing in the lower right corner of the IDE window.
Clicking on that icon opened a dialog informing me that a RuntimeException had
occurred and asking that I submit issue. The details showed it to be an
InvalidObjectExpression.

Once this exception started happening features such as code completion, syntax
checking, and refactoring stopped working. All I get is a little "please wait"
tool tip that stays on the screen until I click somewhere in the editor window.
Saving the edited file with ctrl-S in the editor window also no longer works.
"Save All" from the File menu or tool bar appears to be the only way to save the
file.

I will attempt to attach the message log as the error dialog requested, and also
a copy of my Java source file. However, I don't see anything on this issue
submission page that will let me do that.