This may help:-
close Excel

run regedit.exe
goto HKEY_CURRENT_USER\Software\Microsoft\VBA\6.0\Commo n

rightclick the value for "Dock" and select delete
close regedit

startup Excel all panes are now re-established.

"Sentinel" wrote:

I was playing around with the Visual Basic editor window and have now ended
up with the Project Explorer; Properties; and code panes not grouped
together. When I rightclick and choose dockable, the window docks to the top
of the window but not to the other panes.

How do I reconnect these three panes please, help much needed.