Video embed codes won’t stick when i switch to “visual” in adding a post

Hello all,

We have recently updated the company video blog http://dssimonvlogviews.com to version 2.7.1 and it is having trouble getting iframe embedd codes to stick when the post is viewed in the visual dialogue box. When viewed in through html, it sticks, however this limits user ability. Does anyone know what the problem would be? Could it be a problem with iframe? Updating firefox? If anyone could let me know, that would be fantastic.

Also, I am having trouble moving around jpegs when I insert them. Does anyone have any tips on this as well?

Thanks so much!

James