A have a couple of blogs that use the Twenty Ten theme.
I find that when using the Visual tab, random keep appearing in the code, giving massive double paragraph breaks which gives loads of white space and looks rubbish. It particularly seems to happen before and after images.
The only way to get rid of them is to switch to HTML view and manually delete them and then click save. If you save while viewing on the Visual tab, it puts them back in.
This has only started happening in the last couple of weeks and is quite frustrating. Is anyone else experiencing it and can anything be done to stop it happening except for the slightly tedious manual fix described above?