One
of the most common bugs in NPDS is corrupt or incompatible
preferences for any of the installed components. This is due in part
to the complexity of inter-module communication and in part to my
relative inexperience with the NewtonOS. When confusion strikes, the
best thing to do is Nuke the prefs entries. Since there are a LOT of
installed prefs, I wrote NPDS Wiper to batch-erase all NPDS
preferences.
To use NPDS Wiper, tap its icon, then choose "Clear". After a second, you'll be given the option to Reset. You should do allow the Newton to do so. (Choose 'Yes')
WARNING: If you erase the prefs but do not allow the Newton to reboot itself, NPDS will fail horribly if you try to start it up. It REQUIRES its preferences and they won't be re-initialized until all the packages are re-activated by a restart.