Error when closing GUIs

Hi,

I am using AudioWeaver 6.17.06 Pro. I have noticed that sometimes AudioWeaver does not close all the GUIs when I hit 'Close All' in the Inspector Menu. Whenever that happens I see the following message (in red letters) in the MATLAB prompt.

ERROR: Event handler returned an error.
  Error stored in AWE_INFO.designer.lastComErr. Type:
  rethrow(AWE_INFO.designer.lastComErr)
  to examine the error in detail.
  Summary Message: The specified key is not present in this container.  File: gui_get_name
  Line: 0

Then if I run

>> rethrow(AWE_INFO.designer.lastComErr)
Undefined variable "AWE_INFO" or class "AWE_INFO.designer.lastComErr".

Any ideas what is going on?

Thanks.

Pablo