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I was experiencing a problem that sounds "similar" to you "might" be having. Spent hours trying to figure it out to no avail.
Finally, I went in and changed the them back to the default. Then ... not wanting to "give in" I changed it back to my preferred theme to tackle the problem again.
Surprise ... the dang thing decided to single space things this time. Themes with attitudes ... dontcha just love 'em.
Peter