IUb and reporting contacts

[Wolfram]

So far I am very pleased with IUb but one thing has been troubling me on my patrols - reporting contacts.

Not that I think I get too many or too few as another thread may reference.

My trouble is it seems I am unable to report to Bdu contacts I make with convoys.

I attack a convoy escape stay in hydrophone range surface keep visual contact and send a contact report but it never seems to get registered/recorded - the radio man reports message sent but even days later no acknowledgement from Bdu - lol wonder if the war is over in Dec 1940 and Bdu is out of operation?

I have repeated this in storms, at night and in day time on now the last 4 patrols - nothing new added except IUb patch 101 to 102.

any thoughts?

TIA