Emulator

Game Name?
Mini Ninjas PAL

Game ID?
RNJP4F

What's the problem? Describe what went wrong in few words.
Cutscenes render correctly if IR is set to 1x, 4x, 5x, 6x
(Note: 5x and 6x enabled from a patch)
With every resolution between 1.5xIR to 3xIR there are artifacts
Screenshots at the end of the report.

What did you expect to happen instead?
Cutscene should always render correctly

What steps will reproduce the problem?

1. Set the IR desired to test (3xIR and 4xIR are good examples)
2. Start the Game
3. Create a profile (first time only)
4. Start the story mode (Play Game)
5. The first cutscene is a good example. (Hint: press 2 to skip, it is very long)
6. About 15s into the game directly after walking out of the cottage another cutscene

Dolphin 3.5 and 3.5-367 are old versions of Dolphin that have
known issues and bugs, so don't report issues about them and test the
latest Dolphin version first.
Which versions of Dolphin did you test on?
4.0-607
4.0 stable

Does using an older version of Dolphin solve your issue? If yes, which
versions of Dolphin used to work?

What are your PC specifications? (including, but not limited to: Operating
System, CPU and GPU)
CPU: Intel i7-4770k
GPU: Nvidia GTX660 with driver 319.60
OS: Ubuntu 13.10 x64

Are you using the 32 or the 64 bit version of Dolphin?
64bit

Is there any other relevant information? (e.g. logs, screenshots,
configuration files)
Screenshots:
Scene 1:
3xIR: http://i4.minus.com/ibld8ol9NQckz5.png
4xIR: http://i3.minus.com/ibz5ky4NngNBTP.png
Scene 2:
3xIR: http://i3.minus.com/iozhExo9IvBOH.png
4xIR: http://i3.minus.com/ibxzSCIpWHTcW0.png