I am building a new installation of FreePBX (FreePBX 14.0.5.25) on RasPBX
All the modules I am using are up to date.
The system is fully configured and was tested working fine and the Dashboard was fully visible.
I powered down, moved the physical location of the box, reconnected to the network and powered up.
Everything seems to be working fine, I can see the modules and configuration and calls are being handled but the problem is the DASHBOARD IS BLANK.
I get a single line of text:
0 System Admin 14.0.31 Copyright 2019 by Sangoma Technologies Inc., A… (and the legal guff).
Clearly a page is being served by FreePBX but there is nothing else - no navigation or context menus.
I was on Dashboard 14.0.4.4
I have tried rolling back to 14.0.4.0, but no difference.
I have tried disabling the SIPstation module (as suggested by someone), but no difference.
I have tried rebooting 
http://192.168.2.171/admin/config.php has that single line of text, as does:
http://192.168.2.171/admin/config.php?display=index
If I go to say, http://192.168.2.171/admin/config.php?display=trunks
then the display is fine and I can access all modules, settings etc from the GUI
Can anyone suggest what to do to get the Dashboard to display?
Thanks.