Accidental input filtering when typing is well-tested, and is actually one of the key features of the Trackpad++ (together with the 3/4-finger gestures and fixed scrolling). So, something went wrong when installing, I have no other ideas.
Suggestion: please try to exit '++' icon from tray and then reinstall using the new build released today.
By the way - here is the changelog for this new build (2.4a):
- 3-FINGER DRAGGING ADDED, as well as the new (related) configuration options;
- Back/forward gestures and middle-click emulation moved to 4-finger space;
- [Windows 8 only] Edge-gestures reliability raised, it shall be literally 99.999% now;
- Improved behavior when you choose to disable scrolling acceleration;
- Other (minor) bug fixes.
Just like the previous version, the Trackpad++ driver is compatible with Windows 7 and Windows 8, 32-bit and 64-bit. Made for Macbook Retina/Pro/Air Mid-2009 to Late-2012.