Hello, i’m kinda new to the forums, my problem i think it most have an easy solution but i’m stucked just because of it, i saved my topology mesh (i was drawing the face by then) and i saved the file, now that i try to make new edges, it just doesn’t work, i would really apreciate the help on this matter 
Try toggling “Edit Topology” (Topology Subpallet) off and on. It sometimes helps.
-K
Thanks a lot man, it did work 
now i can finish my model!!! Finally lol