Linkr 2.3.9 addresses some of the reported bugs, especially in Internet Explorer. It should also work better with the latest versions of the JCE and JoomlaFCK editors. So give it a try if you're using any of those two editors.
It seems as though there might be a glitch the default editor (TinyMCE) when inserting content - such as images, pagebreaks and the read more break. If you think the problem is coming from Linkr, tell us why in the forums .