Thanks Burr, yup it's that issue with the original version 1.0 when Internet Explorer v8 has been installed, there was a change in behavior in IE8 that happens to have a side effect of the OK/Cancel buttons not showing up. The version 1.1 update avoids this problem.

It looks like you have already found the update link, but just in case for anyone else reading this, the v1.0 to v1.1 updater is available here:
http://moi3d.com/1.0/update/moi_v1_1_update.exe

When you run that updater it will patch your 1.0 installation to be version 1.1 instead and then you should be able to run fine with IE8.

Version 2 already has the update included with it.

- Michael