What does the box with check mark in it mean?

It means that You have that File downloaded already. Check it out. Look at a File with a Check Mark, and see if you have it in your library. Thats to keep you from downloading it again.

If thats the box with a check mark in it that your talking about. Your question is a little vague.

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I Don't Suffer From Insanity, I Enjoy Every Minute of it

This was half the question I was looking for, and hate to hijack a thread...
I want my LW to show me songs I have in my library, and give me that little check mark. But I cant seem to find it anywhere when I search.
I have searched for songs that I know I already have, to see if I can get that checkbox, and nothing...

LW 5 doesn't show the checkmark icon - shows a book icon instead

If you're using Classic view




If you're using List view (check at the bottom of search results... this file showed at the bottom of my search results when in List view)

I have noticed that, but also noticing that it will only mark files that I have DL'ed since the install of v5...

The other 6000 songs in my collection seem to be ignored...

Sorry - guess I didn't read your OP properly

Songs downloaded with LW 4 don't show as previously downloaded for me. And whereas a search would once show a checkmark beside a file which you'd added for sharing & that someone else had downloaded (eg a file ripped & added to the shared folder), that doesn't show in LW 5 either.

Ask at this other forum, where the developers answer questions: LimeWire 5 - LimeWire Forums

They'll be able to give you a definitive answer