Diary of cause-an-exception

July 18 2016 16:45 update system via Synaptic (sole item: /josm-latest_1.5.svn10558_all.deb)
July 18 2016 16:50 load JOSM + update plugins + collect Status Report + save: Status_Report-initial.txt
July 18 2016 16:53 acquire server download
July 18 2016 16:54 switch Bing aerial imagery ON + Postcode (UK) + zoom in on Worth Street
July 18 2016 16:53 use Building Tools to outline terrace of 9 houses
July 18 2016 16:58 use terracer to create terrace of 9 houses (create an associatedStreet relation=YES; keep outline way=NO)
that creates an exception at the end:- click 'cancel'
the terrace is created, as is the relation - both look fine
July 18 2016 17:03 add postcode to each terrace
July 18 2016 17:05 click to uplift changes to server
'An unexpected exception occurred... always a coding error'
click 'Do nothing'
July 18 2016 17:09 collect Status Report + save: Status_Report-after-exception.txt
July 18 2016 17:11 save this diary as Status_Report-diary.txt