This may be just some warning from your IE browser based on the settings you have. If you can still get the link inserted then it would seem to be the case. To test this out to see if that is the problem please post back with a link where the editor can be used, I can try doing the same thing in my browsers to see if I get the same result. If I find any problems I will let you know and we can look into those issues further. If in my testing I do not get the same result it would indicate a setting in your IE. You can check this part yourself by going into the options for your browser and checking the error reporting settings in the advanced tab.
