Don't have a screenshot but allow me to explain:
I was grinding like everybody else is right? I head to my map, someone invites me to join them. I join them ans my joystick is gone.
I've triple checked all the settings, signed out then back in. Nothing. I'll keep trying see if something changes but... >_< using 'tap to move' just isn't me lol.
Oh and this is on mobile. Motorola DROID X from Verizon.
Edit: Okay so last night I logged off and went to bed with my phone off. I turned it hack on this morning and logged into DL. Joystick was still gone, I decided to fiddle around with the settings one last time and, it came back.
I swear I didn't leave the settings alone last night >_< And even if it was the settings that doesn't explain why it just disappeared suddenly when I was nowhere near the options page.