Drawing a circular flow

[Marshall Feldman <marsh uri edu>]

Hello,

I'm new to Dia and have found it very useful. But I'm having one 
problem. I want to draw an arc that starts and ends at the same node. I 
tried using the curved line connector and can almost make it into a 
circle, but when the end of the line gets close to the original box, it 
seems to collapse on itself, so instead of a circular flow it just looks 
garbled.

In case you're wondering why I want this, think of a bank ledger for a 
mortgage. Every month, the bank adds interest due to the balance of the 
mortgage. If there's mortgage payment (a separate flow transaction), the 
balance is reduced. But the original ledger entry starts and ends with 
the bank.

Thanks.