After i have installed the update to the 3.0.1 i have encoured this problem (see only the images... the first display the problem, the second is the correct after i have resolved this problem).
Problem in the editor
The problem can be resolved reinstalling the style.
I have deleted the installed style and after i have reinstalled the same taken from the update packages.
I think that the problem that i have write for this forum can be the same
Here is the problem in this board problem in the wysiwyg editor