Problems after upgrading to WordPress 3!

Hello.

Ok this problem has only arrived since upgrading my blog to wordpress version 3.

When ever i try to use the “thumb” custom field to appy a thumbnail to my posts the image no longer shows up.

It has done up until i upgraded.

https://www.tutscene.com/ – as you can see no thumbs :S

The only problem i could or can think of is that i store all my thumbs in /thumbnail not in my uploads area.

Would this cause the issue?

Please help!

Liam