is there a log file generated by live update to see which files were updated?
You must generate the log manually but, it's useless if the files are already updated, so you are still getting the elevation problem for some other reason, like another scenery in conflict.
The only sure way to check if your file is updated, is to check the MD5 of the KDFW_Platform.bgl file, which is the only file needed to fix the problem. You must use an MD5 check utility, and check if the MD5 of the file starts with 21A8. If it does, it's the latest version, and your elevation problem, which is now fixed, is caused by something else, not by the scenery.