A very strange behavior and no idea where it comes from.
We have a productive sql server 2005 database and an identical database for development purposes both fulltext enabled.
Like with other databases we make a backup of the development DB and restore the backup over the productive db.
We have identical DB paths and the ft catalog names and ids are the same.
We can see no differences between both instances.
Also deleting the productive DB first had no effect.
Searching "where contains ' "DA=SPRITZE" ' has results in the dev DB but no results in productive DB.
Other contain statements are running correct.
It seems that the "=" is missinterpreted somehow?
Searches with german umlauts are running correct too!