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Hi All, I am using PHP 5.4.14 along with APC on Linux for my production environment. Every once a while users browsing the website get a blank page on a POST action like searching for orders. Refreshing the page loads the page correctly. any idea? Following are setting for APC: cat apc.ini extension=apc.so apc.shm_size=150M apc.stat=0 Runtime settings: Runtime Settings apc.cache_by_default 1 apc.canonicalize 1 apc.coredump_unmap 0 apc.enable_cli 0 apc.enabled 1 apc.file_md5 0 apc.file_update_protection 2 apc.filters apc.gc_ttl 3600 apc.include_once_override 0 apc.lazy_classes 0 apc.lazy_functions 0 apc.max_file_size 1M apc.mmap_file_mask apc.num_files_hint 1000 apc.preload_path apc.report_autofilter 0 apc.rfc1867 0 apc.rfc1867_freq 0 apc.rfc1867_name APC_UPLOAD_PROGRESS apc.rfc1867_prefix upload_ apc.rfc1867_ttl 3600 apc.serializer default apc.shm_segments 1 apc.shm_size 150M apc.shm_strings_buffer 4M apc.slam_defense 1 apc.stat 0 apc.stat_ctime 0 apc.ttl 0 apc.use_request_time 1 apc.user_entries_hint 4096 apc.user_ttl 0 apc.write_lock 1 Any help is much appreciated. Thanks Sameer