installed 2 new plugins, html entities not working, is that possible?

Hi,

I have installed two new plugins: Routes (which displays Google maps) and Thesography (which is use to get GPS co-ordinates from my images). So far I have only posted two posts since I have activated these plugins, and in both, my html entities are not working – the missing character is displaying in Firefox, and Safari is just not putting anything in.

Is that possible? Or could it be that coincidentally something else has gone wrong. Where in my database would I look for whatever controls html entities?

In the rest of my website which is not involved with the blog, the html entities are working OK.

I am at a total loss, and any help would be greatly appreciated. I can show include anything that might help, but at this point I can’t think what that might be.

Thanks in advance

Cliff