Changing a form's action buttons using R5 designer when the form will be used on R4 clients can cause big problems. This is also a problem with Notes 7 changin Notes 6 shared action buttons.

There seems to be a problem with action buttons and differen versions of designers.

See:http://www.notesninjas.com/A555F9/nn.nsf/ByAlias/ActionButtons

There is also an issue with changing notes 6.03 shared action buttons with an notes 7 designer.

The buttons don;t update with a design refresh.

One way around this is to delete the shared buttons from the forms.

Update the shared Action button code etc

Then re-add the shared action.

Pain , but a workaround.

You could always just use a notes 6.03 design client....