Tactics ELO
Sometimes, after solving a problem, java seems to be caught in an infinite loop, e.g. after i solved Tactics Nr 34872(I played 1.Nxd5 Qg7 2.Ndxe7+ Rxe7 3.Nxe7+ Kh8 4.e4, but I couldn't reproduce the infinite loop by retrying this variation). Then on the next yet unsolved problem(Checkmate 39095), instead of showing the explanatory prose(best variation or =, >=2 pawns, skipping=fail) it shows the statistics of the solved former problem Tactic Nr 34872. After solving Checkmate 39095 everything is normal, again.