Missing Account Drop-Down Menu

[Volker Englisch]

 > The lack of dropdown menu seems to imply that it doesn't
 > think you have any accounts, or at least you dont have any
 > accounts that match the filters.
 >

Would you have a suggestion how I could trouble-shoot this problem?
I'd like to resolve this somehow since I'm currently unable to send out 
my monthly invoices.  Where could I start looking into this?

-- 
Volker Englisch