Becuase becuase bcoz because becauz 

Anybody else get "becuase" as correct spelling, no red-lining.  Not really sure where the spell check list is, or how to fix it.  It's my most common error.  It only shows as incorrect if the first letter is capitalized.

 

I get the spell check red line when I type in becuase

It's an option in your browser.  If you are using Chrome go to the settings advanced area and modify the language settings.  You may have added the wrong spelling to your allowed list.

Thanks Mike.  I found the ":custom" list.  It contained about twenty misspelled words, probably from many years ago.  It must import with bookmarks or something.  I remember when you could choose a word as "correct", but if you clicked "correct"  by mistake there was no apparent way to undo it.  Finally...gone.  Still had to figure out how to delete words from the list.  Not obvious.