Via:
http://forums.sun.com/thread.jspa?threadID=5402790&tstart=0
If one uses the spell checker and corrects one or more words then for each line of the post a new empty line is inserted after the line. If one then uses it again and corrects one or more words then one ends up with four lines for each original line. etc etc etc
Bug
Resolved
Minor
Spellchecker introducing unwanted lines
Login and goto post a new message page.
Type in the message with spelling mistakes on purpose.
Example:
Testt
Brightt
Click on Spell Check.
Spell checker pops up
Fix mistakes. Save and exit out.
Success: When exited out of the spellchecker, the message preserves the exact ordering including the line breaks and does not include any unwanted lines.
Failure: Message appears with an unwanted line.
Example
Test
Bright