Sounds to me like someone's blowing smoke up your you know where.
It's going to take a lot of force to "snap" a fork off in the gearbox, and if it does happen, you're going to have more problems than just a ticking noise. The shift forks are what moves the selector hubs, and the selector hubs are what engage & disengage the gears, a snapped fork will either prevent a gear from being engaged, or being disengaged, it's quite common for one fork to be used on "pairs of gears", so the low speed fork handles first & second, the high speed fork handles third & fourth and you might have two more for fifth & reverse.
Which gears did you say you weren't getting?
It's going to take a lot of force to "snap" a fork off in the gearbox, and if it does happen, you're going to have more problems than just a ticking noise. The shift forks are what moves the selector hubs, and the selector hubs are what engage & disengage the gears, a snapped fork will either prevent a gear from being engaged, or being disengaged, it's quite common for one fork to be used on "pairs of gears", so the low speed fork handles first & second, the high speed fork handles third & fourth and you might have two more for fifth & reverse.
Which gears did you say you weren't getting?