Without changing any options in UR (using UR 1.3.2.9 [the latest version on the web site]), after installing the Adobe SVG viewer from the URL above, I was able to view the SVG
http://www.adobe.com/svg/demos/usair/index.html
both without importing (by navigating to that address in the UR address combo) and importing as an item (by copying and pasting that URL into the UR data explorer tree). In both cases the SVG is displayed and operates as it does in IE. This was with IE 6.0 SP2 on Windows XP SP2 and version 3.03 of the SVG viewer.
Does the above SVG display properly in stand-alone IE and/or the UR internal browser on your machine? What steps are you using to view the page in UR? What is the info from Help | About | Install Info? Which version/SP of IE are you running? Which version of the SVG viewer?