Visual Editor which is using in WP 2.5 now - TinyMCE - is broken.
Many users suffer from this problem.
It looks like on this screenshot: http://clip2net.com/clip/m0/1207310781-clip-4kb.png
Going someone to decide this problem? And for these days, since the update of wordpress, nobody of administration or developers even paid a regard to problem. Users must decide problems themselves. Does support must operate so?
There is some links with help to resolve this bug, from WordPress Users.
http://wordpress.org/support/topic/165449
http://wordpress.org/support/topic/166212
http://wordpress.org/support/topic/164990
HOW LONG we must wait, until this problem will be fixed?..