@ noelmoralde
I always keep backups of old plugins which is why I could upload an older working one. And yes, what you described as a layout mess is exactly what I got to - except you explained it better than me!
@ microkid
I went to upgrade the plugin again so I could get screenshots of what is happening for you and seems that the gremlin has moved out of the admin- it now displays properly. I also did a new post and added a related article and it was all good but when I did a new post with no related posts it messed up the layout again
http://inthetravelworld.com/ is where you can see the post without a related one and messed up layout as well as a post with a related post and no messed up layout
Now that I see what the new layout in the admin for related posts is I will try and describe what it was like. (It is ok there now)
There were no tabs for Posts and Pages - instead they were just listed under each other - hyperlinked
It then said related without the box
Under that Search Items - A little box and Title Content Both with the buttons
Then that again. Here is an idea of what it was like:
----------------------------------------
Posts (0)
Pages (0)
related
Search BOX HERE Title Content Both
related
Search BOX HERE Title Content Both
------------------------------------------
The only place where there were boxes was where I put BOX HERE above
For posts that already had related posts it was as follows:
----------------------------------------
Posts (2)
PostTitle x PostTitle x
Pages (0)
related
Search BOX HERE Title Content Both
related
Search BOX HERE Title Content Both
------------------------------------------
Hope this helps :D