Changing the embedding code as follows did the trick.
<object classid="clsid:D27CDB6E-AE6D-11cf-96B8-444553540000"
id="index" width="1550" height="1030"
codebase="http://fpdownload.macromedia.com/get/flashplayer/current/swflash.cab"
align="middle">
<param name="movie" value="UbiPictureViewer.swf" />
<param name="quality" value="high" />
<param name="bgcolor" value="#869ca7" />
<param name="allowScriptAccess" value="sameDomain" />
<embed src="UbiCollage.swf" quality="high" bgcolor="#869ca7"
width="1550" height="1030" name="index" align="middle"
play="true"
loop="false"
quality="high"
allowScriptAccess="sameDomain"
flashVars="IP=<%=IP %>"
type="application/x-shockwave-flash"
pluginspage="http://www.adobe.com/go/getflashplayer">
</embed>
</object>