Hey Gustabo,
I was one of those who had endless frustration with Concrete Limiter in X3, so much so that I had to remove it from every project I had ever done and replace it with another limiter. For me, moving to Platinum seems to have done the trick!! I now use it again on every track and have not had a single issue. Do bear in mind though that I also simultaneously upgraded my computer, as well as Autotune (from version 7 to 8) which had been causing huge issues also. I wish I could say that the improvement in Concrete Limiter is entirely because of Platinum, but I can't say that with absolute certainty because of the other changes I've made.