As a test, can you show us a topic in which that string exists? A quick test shows that searching seems to be working fine.

A search for "Ambisonic" reveals this topic, at the bottom of the first page: http://www.meridianunplugged.com/ubb/ultimatebb.php?ubb=get_topic;f=5;t=000944

A search for "final choise" reveals this topic, the oldest in the forum: http://www.meridianunplugged.com/ubb/ultimatebb.php?ubb=get_topic;f=5;t=000024#000000

The space thing is a side effect of how the indexing works. All non-searchable characters are removed from the string before indexing, then the indexed string is cut off at a certain admin-defined point, 210 characters by default. After the first 210 characters in a post, the remainder becomes unsearchable. You may find that is what's happening here.

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