I've noticed this same issue in my A/R module too...if I'm in an invoice batch creating a new invoice and I click on "Customer" to look at past transactions, if I click "Applied" or just double-click on the transaction when I close the details and then close the customer details the whole module minimizes. If I close the customer details without viewing the applied details then nothing happens. Has this issue been addressed in a service pack yet?

Thanks,
Jean