Which Raspberry are you using ?
- A, B, B+ v1.x are ok with previous SmartDmd versions (until v2014-10-06)
- B+ only for the latest SmartDmd version (v2015-02-22)
- The latest Raspberry v2 is not working well with Stern/Sam (some glitches on the screen). I don't know (yet) for the other games (DE,...) but I feel confident it will work well as the signals are slower.