Apparently GetSimple Blog has a conflict with Multi user plugin. See here: http://get-simple.info/forums/showthread...9#pid59309 (you should post there if you have problems with the plugin in the future).
Btw. for blogs you can also use the i18N search plugin . Here's some info about configuration for a blog: http://mvlcek.bplaced.net/get-simple/search-news/
Btw. for blogs you can also use the i18N search plugin . Here's some info about configuration for a blog: http://mvlcek.bplaced.net/get-simple/search-news/