We have several times observed that R_Trig is not working. For example, the R_Trig.Q connect to RS's set parameter, after we set R_Trig input to true then, no matter we see that the R_Trig.Q comes to True or not while the RS remain reset state.
I have been working with Control Builder M since its very first version and I have never noticed that R_Trig has failed. Use Find tool in your Program editor to search for R_Trig and RS instance names. As Rob and PLidskog already wrote, likely there are same instance names for R_Trig or RS shared with other FBs. Sometimes happens during FBD code copying that CBM doesn't warn about the same instance name in copied code. Another issue may be that your code is writing to your R_Trig.Q or to RS.Q from other code tab. That sort of tricky programming should definitely be avoided.