Thanks Mr. Papa and Yellow Swordfish, I have got it working now. 

It appears that Mr. Papa was right and images were far too large to be accepted. I have reduced them from 420 x 420 to 33×33 and it works perfectly now => http://lowcostmarketingstrategies.com/forum/

Thanks for the support 🙂

Well I am glad it is working but a little surprised at the diagnosis. I will run some tests…
Thanks for the update and I hope all goes well.