I guess some of you missed my point.
There have been past attempts to fix the compatibility issue between IE and this software.
It has been hit or miss on some sites probably due to the user's desktop configuration, but the usual reported issue is either login and/or registration problems.
SD has now revamped the fix in 7.5.7 so hopefully the issue has been resolved once and for all.
I currently have one site that has this type of issue with their members and was looking for feedback from someone that has experienced this problem in the past and now is corrected on this new release.
I would like to inform them this is fixed and they should upgrade.
PS,
My default browser is Firefox.
I myself have never had a problem with using IE.