One client?  All clients?

I just checked and it works for me.  The standard procedures for stuff like this is:

1  Reboot your computer.

2  If that doesn't work, try running updates

3  If that doesn't work, go to your computer start menu and click on ProSeries and select "tools repair updates"

4  If that doesn't work, throw your computer out the window ............ or uninstall and reinstall ProSeries