After update to 0.96.3 - Dev-tools aren't working anymore?

Dear community

I just updated to 0.96.3 from 0.95 and somehow all the dev-tools aren’t working anymore. I read something about the new sidepanel, but didn’t see any breaking changes?
When I click on the new "developer_tools* link in the side panel or on the dev-service, dev-state, aso. link I just get a blank page on the right side…

Anyone facing the same issue? As I can’t access dev-info I don’t see the log, but the system log under Hass.io -> System shows:

19-07-23 07:15:22 INFO (MainThread) [hassio.api.proxy] Home Assistant WebSocket API request initialize
19-07-23 07:15:22 INFO (MainThread) [hassio.api.proxy] WebSocket access from a0d7b954_nodered
19-07-23 07:15:22 ERROR (MainThread) [hassio.api.proxy] Client error on WebSocket API Cannot connect to host 172.30.32.1:8123 ssl:False [Connection refused].
19-07-23 07:15:27 INFO (MainThread) [hassio.api.proxy] Home Assistant WebSocket API request initialize
19-07-23 07:15:27 INFO (MainThread) [hassio.api.proxy] WebSocket access from a0d7b954_nodered
19-07-23 07:15:27 ERROR (MainThread) [hassio.api.proxy] Client error on WebSocket API Cannot connect to host 172.30.32.1:8123 ssl:False [Connection refused].
19-07-23 07:15:32 INFO (MainThread) [hassio.api.proxy] Home Assistant WebSocket API request initialize
19-07-23 07:15:32 INFO (MainThread) [hassio.api.proxy] WebSocket access from a0d7b954_nodered
19-07-23 07:15:32 INFO (MainThread) [hassio.api.proxy] Home Assistant WebSocket API request running
19-07-23 07:15:32 INFO (MainThread) [hassio.homeassistant] Detect a running Home Assistant instance

Any ideas?

…sorry… stupid me… I did forget to make a full refresh of the page

the new layout wasn’t loaded with automatic refresh after restarting hassio…