Yeah this happens to me as well.
If it is under same subject/topic, you will notice it only delete one of the latest post for that topic only when ticked and pressed 'Delete' Button
If possible like bidfordun, can we have a 'delete' option where all the messages under same subject/topic can be deleted at once?
I also thot something wrong with my inbox earlier. The new PM feature is very good for me

just the delete part.. confusing bit at first
Btw, @ TS, i think title should be 'Can't' Delete all msg eh... not 'can' cos I was confused by this earlier...
QUOTE(bidfordun @ Jul 3 2008, 07:36 PM)
may you only delete one message after selecting one message which consists of many messages?
it happened to me too. is there any way to just directly all pm in one pm?