I still believe that this constant stream of 'new incompatibility issues' for users of Internet Explorer are a determined and manipulative move to make us all switch to Google Chrome.
I will not be bullied into switching browsers!
So, after much research and moaning (lol) I have discovered a wee fix until blogger fix it.
If you are experiencing the same problem as me and have a 'compatibility button' (situated top left) on your address bar like the one below:
then as soon as you enter your 'edit post' page, click the icon and it should fix it.
It worked for me :)
Hope this helps, if you are stuck,