The symptom is that Command-K doesn't work to Remove All Summaries.
For example, try pressing Command-T, then Command-K. The Command-K just beeps. If you click anywhere (even on the selected cell), then Command-K works. I think that the menu bar isn't actually updated until there is a click, so the Command key equivalent doesn't actually exist yet.
The same problem happens if you use the Group command and then immediately use Command-K.