Typically "white pages" sounds like a "ran out of memory" problem, with solutions readily available in the forums here. But that plugin is for 1.* installation per http://plugins.b2evolution.net/index.php?s=geocode&sentence=AND&submit=Search so I would not expect it to work in 2.* until the author upgrades it.

My php info file says memory_limit 32M and my installation of b2 is quite new with just 2 extra plug-ins. Shall i ask my administrator to even increase the limit? i thought 32 is enough. :-/

It probably is. You could try downloading the plugin again and re-uploading it just in case you somehow have a corrupted copy of it, but maybe the plugin is just no good.