When you bring up a cell editor (Double Click in the results area). This launches a separate appliacation (visible in Task Manager). If you Highlight Ctl-C then change applications to do a paste, then return to navigator, then cell window is not on top and nothing can be done in navigator. You must find the Cell Editior on your task bar and close it to be able to return to navigator. Not quite the same as 5.5, not very intuitive…
Point taken. We will make sure the cell editor window is always on top.
The problem has been fixed. Now cell editors execute in the same process as Nav. This will be available in the next Beta build.