Wireshark-users: [Wireshark-users] colored packets

From: jon jon <free9360@xxxxxxxxx>
Date: Tue, 21 Jul 2009 14:59:32 -0500
Hi,
I am new to wire shark and was wondering when I am running it. I see a line that is black with a packet, what does that exaclty mean. I know there is a way to set up a color code to different things. but I have'nt change any color scheme, just using the default color setup. So what does that mean the black colored packet. it says in the information down below unreassembled packet incorrect tcp checksum. What is that telling me? I don't understand how to tell what the colors are telling me about the packets. is there some guide that tells you what color a packet is doing?
thanks,
lost