AppHangB1 – Acrobat DC on Windows 7.0 Pro with extra support

Starting Acrobat DC brings up the "recent" screen, with Acrobat icons instead of thumbnails, then changes to a black screen and no content. When I give up on waiting, trying to close Acrobat helpfully informs me "Acrobat is not responding" – I think I knew that! – but also displays a little pull-down "View problem details". This identifies the "problem event name" as AppHangB1.

The web searches I've tried all return results from (at the latest) a couple of years ago, and don't seem to identify a simple, correctable cause. I'm also having problems with the CC app at the moment, perhaps because of working remotely through a corporate server: internet access is fine, which is how I'm able to post to the forum, but the CC app says unhappily "Unable to reach Adobe servers". Related? unrelated? any ideas welcome.