setFixedRight() doesn't seem to work

We are using ActiveWidgets 2.5.1 with the Extended Grid.

I can use setFixedLeft() no problem, but setFixedRight and setFooterCount() don't appear to work. There is no fixed columns appearing on the right or footer; in fact it seems to hide the columns instead of freezing them.

I've tested this in my own code and using the example shown on this site in Chrome, Firefox and IE, but I get the same issue.

I thought that maybe it was my code that was the problem but when the examples on this site don't work I'm thinking there is something else going on.

Thanks!