For some reason, the default character style automagically applied to URLs uses English… which means the spellchecker doggedly attempts to make sense out of that gibberish.
Solution (at least for OOo 3.2):
- F11 to get the Style and Formatting dialog up
- Click Character Styles
- Click Hierarchical in the lower drop-down list to see ’em all
- Right-click Internet Link, select Modify
- Select [None] in the Language drop-down list
- OK your way back out
There, now, wasn’t that easy?
Oh, yeah, you’ll want to do that to all the templates you use to create blank documents, too.