Latest Remote Desktop client not starting on W10 LTSB 1607

Hello. We're using about 50 thin-clients to connect to our AVD systems. The HP t530 thin-clients are running Windows 10 Enterprise 2016 LTSB / ver 1607 / build 14393 / RS1 and have the Remote Desktop client for Windows (msi) installed, with auto update enabled. This all worked fine until the most recent releases of the Remote Desktop client. Starting with version 1.2.6186 the app simply doesn't start anymore. There's no gui, no errors, nothing. Just for a few seconds the spinning blue circle next to the cursor. It does create msrdcw_xxx.etl files in %temp%\DiagOutputDir\RdClientAutoTrace, however i couldn't locate any obvious errors in it. Upgrading to 1.2.6187 does fixes the problem temporary (but that's probably because it's actually based on the older 1.2.6081 version). Upgrading to the latest releases 1.2.6188, 1.2.6227 and 1.2.6228 reintroduces the problem. It's not something in the thin-client image, also did a fresh Win10 1607 install with latest Windows Updates, same problem. Is there anything i can do or try, except blocking all future updates and staying on 1.2.6187?