One other thing to note:

http://psf.upfronthosting.co.za/roundup/meta/msg1458

reports that unlinking/linking changes the order of display of the 
messages. The message is displayed after linking as the newest
message in the issue. Even though the date stamp is the original
datestamp.

This makes it a bit confusing. Consider opening another ticket
for this problem if it persists after implementing these changes.