Re: No longer receive SP

Skill points are awarded by increasing your player level, which in turn is increased by earning XP. You'll see your current level and XP needed to level up in the top right of the menu screens. The XP for each new level gradually increases so where initially you probably got enough XP to level up from one round, in time it takes more. Unless you've already got to level 50 (the max. I think) then I suspect this is what you're seeing.