Hello,
Check this code in CRMCMP_IC_FRAME -> header_jscripts.js
var wndheight = 279; /* fixed height */
var wndwidth = 342; /* fixed width */
g_wndScratchPad=window.open(scratchPadFile,"","left="+scrnx+",top="+scrny+",height="+wndheight+",width="+wndwidth+",location=no,menubar=no,resizable=no,scrollbars=no,status=no,titlebar=no,toolbar=no",false);
Check if increasing height and width will help.