Standard DC form doesn't work in Adobe 9

Hello all,

I've created a form in Standard DC which will be used with versions of Adobe back to version 9.

All the boxes work except the Date Text box.  I've tried using a text box and making it a date field, I've tried the actual date box.  These work fine in the version I'm using but don't work for users with older versions.

I know the "pat answer" will be upgrage but that isn't so easy in this instance.

Is there something I'm missing, anything suggestions anyone might have?
Oh, I tried saving with a protection password with the acrobat 6.0 and newer option selected and still no dice. 

Thanks!