Monday 13 June 2011 12.20pm
I'm guessing that where a picture should be, you see a small box with a red cross in it?
If so, that can be caused by a myriad of things, but if it's intermittent, then a slow internet connection could cause the problem.
Check your speed when all is well and again when you get the problem. Get on the phone to your ISP if you see big differences in connection speed.
Here is a speed checker...