next dialog id error

I have several wizard dialogs that I enable / disable based on user selections. I experience a very weird problem where I have the following setup:
- _SB_DIALOGID=4
- Dialog 5,6,7,8,9 are hidden
- _SB_NEXTDIALOGID=10
- I run Hide Wizard Dialog #10
- _SB_DIALOGNEXTID is now set to 257 ! (Should be 11)

What happens is that I get a empty dialog screen. Really a showstopper bug at the moment, so any workaround or fix would be appreciated.

Hello,

Would it be possible to send us a small demo script?

Thanks,