[X4U] Mail 3.6 Image loading Problem

[LaL]

My thanks to those who helped me with my question about a keyboard  
shortcut for zipping files.
New request for help
I am running Mail 3.6 on a 17" G4 powerPc Mac. I JUST upgraded from  
10.4.11 to 10.5.8.
I am also running ClickToFlash 1.5.5  (to control when flash loads on  
Safari) and Safari Cookies 1.4.1 for Safari.
All software is up to date.
My emails from companies like iFixit and many others now are  
placeholders with "?" marks in them where my guess is image files  
should be.
This was NOT happening when I was on 10.4.11
In mail preferences, I do have selected "Display remote images in HTML  
messages" and my messages do appear to be rich text.
If Ido not check this box, the message is displayed with  blue bar  
with a button asking me if I want to load images. if I do click on  
that bottom, still there are no images.
I am also using Cocktail 4.6.2 to manage logs and weekly delete nearly  
all caches. I also made sure that I am not viewing messages in plain  
text and i also allow messages to display attachments. (These are  
options in cocktail.)
I will admit that I did copy over from 10.4.11 the  
"com.apple.mail.plist" as I did NOT want to go thru setting up all my  
email accounts from scratch!
(For the record, I installed 10.5 after backup up my data to an  
external drive and then wiping my internal drive and then doing a  
clean "virgin" install. I then used the combo upgrade to get me to  
10.5.8. I also have the latest java upgrades installed, and I have  
repaired permissions and used disk warrior to make sure everything is  
OK. )
I just cannot think of what to do next so any suggestions are welcomed.
Thanks in advance
Lee