再酌 - 回复：不会! -- 回复：请问，申请H1-B后会不会影响TN续签?(在等待H1-B过程中能renew TN么？)

The OP is COS pending from TN to H-1, then he leaves (to renew TN at border) the country.

"Service officers are reminded that an alien on whose behalf a change of nonimmigrant status has been filed and who travels outside the United States before the request is adjudicated is considered to have abandoned the request for a change of nonimmigrant status."

http://blog.wenxuecity.com/blogview.php?date=200709&postID=16851#EosCos