Okay the /buyweapon doesn't solve the issue, as that brings up your menu for select your weapons.
I just also found out that it doesn't matter if you have/buy armour or not. When the game loaded, I did /taxi to ammunation. I then withdrew some money with /withdraw 400000. I went inside and did /buyweapon. The menu appeared and I selected grenades. The menu disapeared without giving me the prices menu and froze. I had to do a /kill.
I then drove to the ammunation and did the same thing again it didn't work. The 3rd time of asking it worked, and I got my spawn weapons. It appears to happen randomly, although it normally works after the second attempt.
I just also found out that it doesn't matter if you have/buy armour or not. When the game loaded, I did /taxi to ammunation. I then withdrew some money with /withdraw 400000. I went inside and did /buyweapon. The menu appeared and I selected grenades. The menu disapeared without giving me the prices menu and froze. I had to do a /kill.
I then drove to the ammunation and did the same thing again it didn't work. The 3rd time of asking it worked, and I got my spawn weapons. It appears to happen randomly, although it normally works after the second attempt.