SAP Message QM620 - Action Box Cannot be Displayed: Control Error

Diagnosis
The system could not create the docking control or tree control of theaction box.

Procedure
This error occurs sporadically. If it starts occurring on a more regularbasis, contact your system administrators and temporarily change thelayout of the action box as follows:
When processinf a notification, choose Extras -> Settings ->CTRL/Default values in the menu.
Choose the tab page Action Box and select Action Box Table
.
When the notification transaction is next called, the action box will bedisplayed in the form of a table control.