Fresh install - wierd PHP errors

[grumpy-gnome]

On my WAMPServer environment (fresh install today - v3.1.0) have done a clean install of v4.3 using the MASTER download from the homepage. Got some table errors during the install, but completed OK apparently.

When accessing the site's default index.php I get a bunch of wierd PHP errors including these:
<pre>

Code:

[16-Nov-2017 18:43:46 UTC] No error - Only to create the file
[16-Nov-2017 19:46:27 UTC] PHP Warning:  fclose(): supplied resource is not a valid stream resource in C:\wamp64\www\stock\install\step2.php on line 198
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\users\includes\header.php on line 66
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\users\includes\header.php on line 80
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\users\includes\header.php on line 84
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\users\includes\header.php on line 95
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\users\includes\header.php on line 127
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\users\includes\header.php on line 138
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\users\includes\header.php on line 144
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\users\includes\header.php on line 148
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\users\includes\header.php on line 151
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\users\includes\navigation.php on line 20
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\users\includes\navigation.php on line 117
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\index.php on line 22
[16-Nov-2017 19:46:35 Europe/London] PHP Notice:  Trying to get property of non-object in C:\wamp64\www\stock\usersc\includes\footer.php on line 39

</pre>


Seems related to accessing properties in $settings object...

Configuration is: PHP 7.1.9; Apache 2.4.27; MySQL 5.7.19

Any ideas?

BTW, did an upgrade to 4.3 from 4.2.12 on my other dev box and that went well with no problems!