Dynamics AX 2009 RU5 backwards compatibility problem

Hi all!

There seems to be a problem with the recently released RU5 for Dynamics AX 2009 SP1.
Dynamics AX clients are supposed to be backwards compatible, so you can always use the latest client, even if you want to connect to an application with a lower version (e.g. AX 2009 RU4 client to AX 2009 RU3 application).

But when I tried to connect to an AX 2009 RU3 application (5.0.1500.1313) after I updated my client to RU5 (5.0.1500.2985), it didn’t work.
Dynamics AX only shows the first record in the forms when you use that combination, as you can see in the screenshot below.

Roll up 5

When you connect using a RU4 client (or RU3), there is no problem at all.

Roll up 4

You can uninstall a hotfix rollup from the Add/Remove software screen in the windows control panel if you want to.

I prefer to duplicate the client folder each time I upgrade it so I have all client versions available.
Just fire up bin\ax32.exe for the version you want and you good to go :-).