I got to work this morning and, after upgrading to Yosemite and MAMP Pro, I am getting a series of PHP Errors and cannot get access to to CP (returns blank page). The frontend of the site itself is fetching data from the DB but the issue appears to be with the config file? I'm using FocusLabs Master Config too.
The first error is
A PHP Error was encountered
Severity: Notice
Message: Only variable references should be returned by reference
Filename: core/Common.php
Line Number: 242
The warnings after that are "Cannot modify header information" warnings.
A PHP Error was encountered
Severity: Warning
Message: Cannot modify header information - headers already sent by (output started at /Users/bjh/github/beacon/lighthouse/codeigniter/system/core/Exceptions.php:170)
Filename: core/EE_Input.php
Line Number: 212
A PHP Error was encountered
Severity: Warning
Message: Cannot modify header information - headers already sent by (output started at /Users/bjh/github/beacon/lighthouse/codeigniter/system/core/Exceptions.php:170)
Filename: core/EE_Input.php
Line Number: 212
A PHP Error was encountered
Severity: Warning
Message: Cannot modify header information - headers already sent by (output started at /Users/bjh/github/beacon/lighthouse/codeigniter/system/core/Exceptions.php:170)
Filename: core/EE_Input.php
Line Number: 212
A PHP Error was encountered
Severity: Warning
Message: Cannot modify header information - headers already sent by (output started at /Users/bjh/github/beacon/lighthouse/codeigniter/system/core/Exceptions.php:170)
Filename: core/EE_Input.php
Line Number: 212
A PHP Error was encountered
Severity: Warning
Message: Cannot modify header information - headers already sent by (output started at /Users/bjh/github/beacon/lighthouse/codeigniter/system/core/Exceptions.php:170)
Filename: libraries/Functions.php
Line Number: 446
After pulling the working copy of our site from the dev server and copying the DB it appears as though this issue is only occurring locally. :-/