upgraded to RH 10; need to use IE8

Upgraded to RH 10. We did initial testing w/Internet Explorer 8 and everything seemed fine. However, some users are now reporting problems. (Note: we do not control IE upgrades so we cannot just upgrade them to IE 10).

I thought that we would have problems only if we used the multiscreen output but now I suspect IE 8 is the problem.

Is there anything that can be done on my end to get the project to work in IE? If not, anything besides rebuilding to make project backwards-compatible w/RH9 again?