Win Xp sp3 latest updates.
Synaptic TouchPad v6.2.
(installed into my dropbox folder on my personal PC, they synced to my work laptop)
Default bundle, custom "work" bundle loaded.
I hit tab to do a hotstring replacement of my personal email address from my default bundle in Firefox 3.6.13 and the horizontal and vertical scroll features of my trackpad are immediately disabled.
During regression of the issue, it also came to my attention that all of my shortcut hot keys ("Shortcut Key" in a .lnk file's properties) were then likewise permanently disabled.
The only way I have found to correct this is to do a reboot.