Memcache and garbled text returned by Nginx

[kaspars]

The problem was indeed caused by the php5-memcache PECL package I had
installed from dotdeb (I guess php5-memcache_5.3.5-0.dotdeb.0_i386.deb).
So I compiled a fresh one (from http://pecl.php.net/package/memcache)
using the official PECL installer and everything is perfect now.

Thanks to everyone for helping me figure this out.

Kaspars

Posted at Nginx Forum: http://forum.nginx.org/read.php?2,175470,175701#msg-175701