@jimi - bugger... I don't think I tested it in IE. Should've done that... However, just now the checkbox worked fine in IE7 for me. (Normal functionality is to copy all the fields over and collapse the table of them at the same time.) Question... have you refreshed the page? Sometimes old cached JS causes trouble like that.

@xerbutter - since you did an update, Views may be caching the previous functions or something. I don't know a lot about how it works, but I know I've had trouble in the past and cleared it up by emptying (truncating) the cache_views table in the database.