I've noticed this in the most recent version of fpsc, however i suspect this problem first appeared at the time that jumping and changing directions in mid air was fixed.
If the player jumps onto an object that isn't 90 degrees (a flat wall) he will become stuck on it, unable to land on the object and slide off it.
The first thing you may suggest would be to change the collision from 1 (which i think makes the collision model the same shape as the object) to whatever box is. But i don't think that would work because the object i'm trying to get the player to travel on is an uphill slope. The second suggestion would be to break up the model which i have already done.
It may be worth mentioning that the object is a segment.
:/