I have changed in php.ini from memory_limit = 256M in memory_limit = 512M and my site just crashed.
After that I've put the old php.ini and still the same error, the website stopped to work. I've commented
zend_extension="/usr/local/Zend/lib/Optimizer-3.3.9/php-5.2.x/ZendOptimizer.so"
and some pages started to work, but not all. On some pages I receive the message Fatal error: Out of memory (allocated 35651584) (tried to allocate 7680 bytes).
From this I see that it's 35651584 and this is not 256M, but with phpinfo() it's saying that it's 256M. I don't know what it can have.
I can't access my administrator panel pages.