OK I think I found your problem...
When you start putting in the tags and you type in hive-100504, when you type in the - this message pops up below the tag line

This message will not go away until you clear out the whole post and start over.
I copied the post, cleared it, then pasted the post body back in and redid the title and tags without the hive- in it and it will let me post it that way I think....