I got 4 clips in the patch. My problem is that sometimes when clip 0 and 2 are looping and starting over again and ALWAYS when I change from clip 1 -> 2 and 3 -> 0 the clip doesnt change smoothly. there is a black frame for a mililsecond. I guess this is for MAX to load the clip but is there any way to avoid this?

by preloading them in some way or any other way that makes them change smoothly without any jumps?

1920 x 1080 and are around 12 mb each and about four seconds long.

If it might have something to do with that but they arnt especally big.

My clips are in filesize:
1920 x 1080 and are around 12 mb each and about four seconds long. 

jumpy-start-in-playback-in-video

If you don't preload you will get pauses and its not very nice if you are going to be switching rapidly between movs. You could have more than one [jit.qt.mov] or follow this rather good example of using [poly~] for movies:

Max5/examples/jitter-examples/video/quicktime/PolyMovie

sorry. I really tried but I might be stupid (Im pretty new to max and jitter) but I cannot implement it into my patch. any tip on how to implement poly to the patch above?

thanks a lot! so anoying with this momentary black flash between each clip.

What exactly are you trying to do, I can't quite tell. I can see that:

Mov 0 is read into QT and looping is turned on

Mov 1 is read into QT and looping is turned off

Mov 2 is read into QT and looping is turned on

Mov 3 is read into QT and looping is turned off

When a mov finishes it attempts to bump umenu to play next mov (which doesn't seem to make sense if you are turning looping on and off?)

Mov 0 is read into QT and looping is turned on
Mov 1 is read into QT and looping is turned off
Mov 2 is read into QT and looping is turned on
Mov 3 is read into QT and looping is turned off
When a mov finishes it attempts to bump umenu to play next mov (which doesn't seem to make sense if you are turning looping on and off?)

jumpy start in playback in video ...