Hi Kim,
You have a lot of replies to your earlier post of this same question here
http://www.quiltingboard.com/main-f1...d-t261380.html
Are you having trouble finding your old posts? Go to "Quick Links" -> "subscribed threads" in the bar near the top of this page, and you should be able to quickly find your old posts there.
Short answer - you are FINE! Not everyone cuts sashing with the lengthwise grain. Cross grain sashing will be fine and your quilt will look great.