I am trying to meta-tag our archives and i have issues when tagging files that are over 5 or 6 years old. Bridge will not let me append metadata on PSDs or Tiffs. Occasionally it kicks back an error on jpegs too. These are files that have been sitting on a server for years, untouched. sometimes i have to open them, re-save them in CS5 and then append metadata. Why won't bridge write metadata to old files?