Dietmar,
this was present in IE but seems to be fixed now in the latest versions of moodle. Upgrading moodle brings that button to Liip messages too.
I tried to change different css tags (for example changed relative position of body#message-send or body#message-send input) for liip but this is in fact a problem of frame height in file message/discussion.php. Open this file with wordpad and
change line <frameset rows="110,*,0,200">
to <frameset rows="110,*,0,250">
and change
<frame src="send.php?id=<?php p($user->id)?>" name="send" scrolling="no" marginwidth="2" marginheight="2" frameborder="0" />
to
<frame src="send.php?id=<?php p($user->id)?>" name="send" scrolling="yes" marginwidth="2" marginheight="2" frameborder="0" />
and there will be no more problems with this button in any theme (until you upgrade moodle...) 
#shrinkwrapper {
width: 900px;
margin: 0 auto;
}lines 3 - 6
Hi Patrick
We have just change to your Liip theme and find it really suits our college image. thanks for all your hard work. I have 2 questions first is we have inserted our logo but underneath still is the writing "Zurich, Fribourg, Bern". I have looked in styles sheets and things and can't see where I can edit this text. Could you possibly point me in the direct of its location.
Secondly the text style and font size seems to be fixed at point 10. So when creating a label or HTMl page we cannot create larger font. HOw do we change this so we can have varied font size for Labels and text throughout our site.
Hope you can help
Many thanks
Scott
html, body, div, span, applet, object, iframe,
h1, h2, h3, h4, h5, h6, p, blockquote, pre,
a, abbr, acronym, address, big, cite, code,
del, dfn, em, font, img, ins, kbd, q, s, samp,
small, strike, strong, sub, sup, tt, var,
dl, dt, dd, ol, ul, li,
fieldset, form, label, legend,
caption, tbody, tfoot, thead, tr, th, td {
margin: 0;
padding: 0;
border: 0;
font-weight: inherit;
font-style: inherit;
font-size: 100%;
font-family: inherit;
}
