Why won't certain albums go on my iphone?

So yesterday, I uploaded some albums to my macbook pro 2009 from cds that i had lying around. I dragged them onto my iphone and it all worked, but then i deleted them to fix the album artwork. Now, when i try to drag them to my iphone on itunes, it has the plus above it, but it doesn't load them on. They are proper files, and i've had them on my phone before, so it doesn't make sense that they don't work now. I have the latest itunes (11?) and an iphone 4. Any ideas as to why i can't put them on?

Because you don't know what you're doing.

When you say you have the latest itunes 11 do you also have the stability update 11.0.1 released just before Xmas

If not you can get it here:

http://support.apple.com/.../kb/DL1614

It always helps to have the correct software

You can alter album artowkr in your library without deleting the songs

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