@Monster:
There really is a bug in BGE with parenting and scaling. It’s been there for absolutely years. Think about the number of times that someone on the forum has suggested “Just apply the scale and rotation and everything will be fine” - well, it’s a BGE bug. One with (most of the time) a trivial solution, but there are issues where it cannot be solved an easy way.
@Leralasss:
First you have to compile blender. Good luck…
So I chatted to panzergame about this on IRC today, and it turns out he already implemented a solution (a better one than that patch) a couple months back but it is not yet in the builds due to insufficient testing. I’ll run a suite of tests on it this evening, and hopefully we can see it in master soon. After it’s in master, it will be in the next release of UPBGE.