Here's whatsnew:
A bug fixed version of 6.30 is now available for download.

There was a small bug present in the original release of version 6.30 last week which affected Kempston and Fuller joystick emulation via the keyboard.

How to tell if you have the affected version:

Start Spectaculator
On the Help menu, click About
The old release says "Version 6.30.0566"
The bugfixed version says "Version 6.30.0567"

If you have the affected version, just download and install the new one to upgrade.

Get it here:
http://www.spectaculator.com/

-Trebor