have same logs when upgrade
for the button which permit to switch between tinyMCE editor and standard area, it seems that is Css issues, it is really in the page but css properties hide it ( it is in float: left and have a lot of overflow:hidden ... in ancestors ) very complicated to see it when page growing , only see if editor zone is so smaller than all content are in page without scroll ... play with firebug under firefox to see it ...
ok i have found the css properties which is wrong for screen with not big resolution like mine ( dual screens of 1280x1024 )
with mobule bar in firefox i have this as properties :
<div id="ext-gen46" class="x-panel-body x-panel-body-noheader x-panel-body-noborder" style="background-color: transparent; padding: 0pt 1px 0pt 0px; overflow: auto; width: 709px; height: 758px;">
To see scrollbar entirely must change height to 700px
with no module bar visible i have :
<div id="ext-gen46" class="x-panel-body x-panel-body-noheader x-panel-body-noborder" style="background-color: transparent; padding: 0pt 1px 0pt 0px; overflow: auto; width: 709px; height: 794px;">
and for seeing full scrollbars must set height to 729px ...
two screenshots to understand :