Thanks for your interest orbrey. I'll keep an eye out for any Akamai issue resolution.
In the meantime a quick update. The issue is now intermittent although I seem to be able to replicate the problem almost at will. If the images do show correctly and fast asking for a refresh usually confuses it enough to dither around and eventually show some pretty red cross boxes

As reported earlier I also have a call in with Microsoft and I am still in discussions with them although I suspect my lack of availability will extend any resolution on their part - if in fact it is down to them and not a performance issue. They have asked me to report what the sitaution is in "SAFE" mode and it is roughly the same. The have asked me to do a large number of regsvr32 commands on DLL files and I'm just awaiting a response to a couple of questions I have with them before proceeding.
Will keep you all updated.
And if you are not all bored to death by now, the attachment shows some screen-shots of the manifestation.