i could nail it down having to do with fps_max.

if i dont set fps_max and run in windowed mode everything is okay, the accelerated distance vector in skill1 is okay. i did a debug print on the vector and this is what it looks like:

http://www.ackbytes.com/upload/window.jpg

you can see the value beeing in the same range almost every frame wich is how it should work.

now i switch to fullscreen with limits the fps_max to your monitor frequenzy divided by an integer. it doesnt matter if i set it manual to like 80 or 120 or something in that range, i always get this odd result:

http://www.ackbytes.com/upload/full.jpg

you can see the distance vector value is jumping like crazy! what is causing the stuttering movement. even in window mode if i set fps_max to like 80 i get this stuttering result.

any thoughts on this one? thanks!