Do the cheapest first... switch to Firefox and see.
If it is the client (IE) then the problem is solved.
It could be an "extension" or "plug in" issue, not the client (IE)
per se.
If it is the server side issue, send a nasty letter to sgforums.com
web master and ask him to ask the programmer to look at line 174 of
the webpage code. You must tell him which page.
If he is a smart programmer, he might be able to figure out why it
runs well in his own computer but creates problems for others.
There are always ways to go around the problem. One way would be to
run an "error handling" sub routine to pin point the actual cause
of the error (it might not be line 174 after all.)
But I guess I am getting too technical?