TMG problem

Dear All ; 

greetings of the day , 

Please i have an problem in in my proxy (TMG) . the problem is broken image when i use the tmg as a proxy .

I disabled the caching from it but the image broken problem is still , and i must inform you that the tmg in ESX5.0 in 7GB RAM . Our design is : ASA firewall and TMG as a web proxy . so please advice 

thank you all 

waleed odeh