Аналогичная проблема. Появилась в новой версии. Окружение Windows 8.1 64-x apache2.4 mysql 5.5.40. Самое интересное с таким же по сути php.ini на Ubuntu с nginx работает. Капаясь в логах apache нашел, такое
[Tue Sep 30 21:29:11.459310 2014] [mpm_winnt:notice] [pid 6140:tid 476] AH00428: Parent: child process 2532 exited with status 255 -- Restarting.
PHP Warning: PHP Startup: in Unknown on line 0
[Tue Sep 30 21:29:11.565383 2014] [mpm_winnt:notice] [pid 6140:tid 476] AH00455: Apache/2.4.10 (Win64) PHP/5.5.17 configured -- resuming normal operations
[Tue Sep 30 21:29:11.565383 2014] [mpm_winnt:notice] [pid 6140:tid 476] AH00456: Apache Lounge VC10 Server built: Jul 19 2014 12:25:58
[Tue Sep 30 21:29:11.565383 2014] [core:notice] [pid 6140:tid 476] AH00094: Command line: 'C:\\server\\apache\\bin\\httpd.exe -d C:/server/apache'
[Tue Sep 30 21:29:11.566383 2014] [mpm_winnt:notice] [pid 6140:tid 476] AH00418: Parent: Created child process 8412
PHP Warning: PHP Startup: in Unknown on line 0
[Tue Sep 30 21:29:12.001670 2014] [mpm_winnt:notice] [pid 8412:tid 440] AH00354: Child: Starting 300 worker threads.
Может, кто-то сталкивался, помогите пожалуйста
[Tue Sep 30 21:29:11.459310 2014] [mpm_winnt:notice] [pid 6140:tid 476] AH00428: Parent: child process 2532 exited with status 255 -- Restarting.
PHP Warning: PHP Startup: in Unknown on line 0
[Tue Sep 30 21:29:11.565383 2014] [mpm_winnt:notice] [pid 6140:tid 476] AH00455: Apache/2.4.10 (Win64) PHP/5.5.17 configured -- resuming normal operations
[Tue Sep 30 21:29:11.565383 2014] [mpm_winnt:notice] [pid 6140:tid 476] AH00456: Apache Lounge VC10 Server built: Jul 19 2014 12:25:58
[Tue Sep 30 21:29:11.565383 2014] [core:notice] [pid 6140:tid 476] AH00094: Command line: 'C:\\server\\apache\\bin\\httpd.exe -d C:/server/apache'
[Tue Sep 30 21:29:11.566383 2014] [mpm_winnt:notice] [pid 6140:tid 476] AH00418: Parent: Created child process 8412
PHP Warning: PHP Startup: in Unknown on line 0
[Tue Sep 30 21:29:12.001670 2014] [mpm_winnt:notice] [pid 8412:tid 440] AH00354: Child: Starting 300 worker threads.
Может, кто-то сталкивался, помогите пожалуйста