There was a similar problem to this in this forum over the past couple of days, but in that instance the issue related to Payment Summaries. The issues however are the same and there is a fix available. Please refer to the following link which Reckon provided to that user:
Are you reading any of this Mirko??? John G.
I, too, am having this problem. Called Tech Support a little over a week ago. They sent me the above link. I have tried opening and closing the Send Forms window MANY times over a number of days and still nothing. This is not good enough. It seems a little ridiculous that this is the only way to fix the problem. We are trying to run a business. Who has time to sit clicking buttons for hours just to send off payment summaries and pay slips!