Strange experience the other day. I could not get the syringe to fill. Never had this happen. NEw vial of TRT new needle. Thoughts..... it seemed like it was really thick or something.
Take a syringe and pump a bit of air into the vial. If you have a larger mixing syringe, use that. Not too much though or you will end up with the plunger getting launched when you try to fill the syringe.