Any query like this should be sent via the HOME page to Matt, there's a link at the bottom of every page.
Usually the odd PM will go 'missing' if it's a spammer and Matt knows about it, he deletes those messages before you've had chance to get them.
It's possible the messages are still there but just hidden out of view, in which case Matt will probably be able to bring them back to your in box. If they aren't spam of course.
Sandi
your messages will ONLY disappear if...
You delete a single message
You delete your entire inbox
SOMEONE ELSE logs in and deletes your messages!!
I delete a spammer
No other reason for them going missing. Don't leave yourself logged on to public computers, make sure you have no viruses/trojans, etc.
As a computer programmed by yours truely, the server doesn't just randomly delete things. If a message goes missing them someone deleted it and initiated a script/program to remove the record.
I can however restore all your deleted messages if you like??? Note though that emails deleted by you AND the sender are gone for good. If I do a restore on your messages then it wont be selective,you'll get all the ones you DID want deleted back into your account (unless you give me a date range to restore)