I was doing the last $5 test before sending out a campaign and ten of the email programs didn't generate screenshots. I tested this same file 4 times yesterday and only had one program (mobile me) fail to generate a screenshot. SO now I am not sure if there is a problem with the test program today or if one those last small changes that I made somehow makes my email not viewable in 10 different email programs. Thanks for any helpful advice.
Sorry for the delayed response, but please contact us at http://www.campaignmonitor.com/contact and we can help you out, if you have not already done so.
We use two different external services to render those tests, but sometimes they do run into problems.