Problems with embedding iframe code

[Heathercowper]

Hi there

I am at http://www.heatheronhertravels.com/

I've been trying to embed some iframe code of a personalised map

The code is from this website
http://symbolya.com/trips/summer-holida ... a-194400/#

and here is the code of the map I am trying to embed.

<iframe width="550", height="500", src="http://symbolya.com/trips/summer-holiday-in-istria-croatia-194400/show_embed", frameborder="no", scrolling="no", marginwidth="0" marginheight="0"></iframe>

Initially I couldn't get the iframe code to stay on the blog - I would paste it into the HTML tab, save and then when I went to the visual tab it would disappear. I gather that wordpress can strip out iframes code.

I got around this by installing a plug in and now can get the map to appear. However, I enquired with the website developers and they said that in other users using wordpress could embed the same code with no problems;

Question: is there anything in the code of this specific Revolution Lifestyle theme that could be causing an issue that doesn't affect other themes or blogs? Any other suggestions why I might have the problem but not others?