Hey Kirupa, I remember this bug existed in the past with the vB2 version of the quick edit hack, but if I remember correctly it was fixed in that version.
Apparently the bug is back in the vB3 version of the quick edit hack.
What is this bug you may inquire 
Well, when you use the quick edit hack, it automatically unsubscribes you to the thread, and you need to go into the thread tools menu and choose to subscribe to the thread again if you still want to be notified of replies.
Someone brought it up here…
