Check your censor list:
Control Panel > Primary > Censor
Do you have Censor enabled?
Do you have google listed as one of the words to be censored by websearch?
example: google=websearchCheck your Active Text list:
Control Panel > Features > Active Text
Do you have Active Text enabled?
What is the text your are searching for / replacing with from your Active Text List?
Active Text allows you to set certain keywords to be translated into something different. This is unlike the censor in that this is done when the post is displayed. The main use for this would be to have certain terms turn into a link or an image. An example would be anytime "UBB.threads" is typed it could be turned into a URL to the UBB.threads support community.