Crash on selecting closed Since Last Run... window

[prl]

When I start GnuCash, I get a Since Last Run... window. This window 
appears twice in the Windows menu, once above a dividing line and once 
below it.

If I click on OK in the Since Last Run... window, one of the two Since 
Last Run... entries in the Windows menu disappears. If I now select the 
remaining Windows>Since Last Run... menu entry, GnuCash crashes.

The crash is because:

    Crashed Thread:  0  Dispatch queue: com.apple.main-thread

    Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
    Exception Codes: KERN_INVALID_ADDRESS at 0x00000000e0a80020

It's not only the Since Last Run... entry that's doubled up in my 
GnuCash Windows menu, the main accounts window is also doubled. If the 
Since Last Run... window is open, then all of the Windows menu items 
select the appropriate window. If the Since Last Run... window is open, 
the two accounts window items work correctly. Only selecting 
Windows>Since Last Run.. crashes GnuCash.

Is this reproducible? Is there something broken in my config files? I 
can post more of the crash log if that helps.

GnuCash 2.4.11, OS X 10.8.2, MacBook Pro

Peter