I have the same problem of SIG with IE only. Works fine for Firefox, Safari and Chrome. Have tested turning off or on all other modules but the problem is just related to SIG.
Here is the link.
www.whatididonthisday.com/index.php/component/content/article/25152
Have got other galleries within other articles. If you wish to test them too, just do a search within the site with the following phrase {gal
You will get a list of all those articles with galleries in them.
SIG version is 1.2.1
Joomla version 1.5.8
Have tried IE 6, 7, 8 - all failed intermittently.
Looked with XHTML validator and came up with lots of error relating to SIG. (You can use the Validator button at the bottom right of my website). Am sure this failure in IE is due to a simple coding/syntax error which can be seen in the page source code. Unfortunately, I cannot decipher where the error is.
Anyone got a solution?