Tech tree Bug

I was playing with the new update (1.10). I was playing the Russians and picked the breakthrough assault strategy. I was going up the tech tree and wend down the path that starts with the "inspiring peach", and went up that path till i got "IL-2 Sturmovik". Then i started down the other path with "Sherman M42A (76) and got to "mechanics". I then noticed that I could not get passed 4 tech points so i could get "The Juggernaut" which costs 5. Whenever the circle would get filled, instead of giving me another tech point, it would go back to being empty and i would still be at 4 points. Has anyone else experienced this problem? Is there a fix for this?