Only Up Dow arrows and 0 in temps visible

[Grogyan]

Using the PI 2
Official 7" display
Installed Chromium and matchbox

I see only the up and down arrows and temperatures all show zero
Not yet plugged in the RAMPS board as i'm trying to setup up the system without it at the moment, and also, I cannot readily attach and detach the RAMPS from my 3D printer

I would have expected to see more details in the UI

Have setup the autostart script,
sudo nano /etc/xdg/lxsession/LXDE-pi/autostart

@lxpanel --profile LXDE-pi
@pcmanfm --desktop --profile LXDE-pi
@xscreensaver -no-splash
@Sed -i 's/"exited_cleanly": false/"exited_cleanly": true/' ~/.config/chromium/$
@chromium --kiosk ~/OctoPrint/index.html

This after trying with the OctoPrintNano scripts in ~/OctoPrintNano which had the same effect

[moritzmhmk]

You could press Ctrl + Shift + J in Chromium to open the javascript console.

If you see messages like:

• No 'Access-Control-Allow-Origin' header is present on the requested resource. then you need to activate Allow Cross Origin Resource Sharing (CORS) in the API Settings (and save the settings)
• 401 (UNAUTHORIZED) the api_key stored in api_client.js was not set correctly
• net::ERR_CONNECTION_REFUSED the api_url in api_client.js was not set correctly (or Octoprint is not running)

409 (CONFLICT) messages are normal and are caused by asking for information about the printer when it is not connected