We are awaiting updates on mirror client in the meantime just restart client if it ever throws an error Make sure to use default OSRS launcher, make sure to hook client while logged out, make sure to start script while logged in and fully loaded (passed the welcome screen too) it should be more stable than usual.
For cannoning: How far away is your safespot to your cannon tile? I will run some tests and add an update.
For tasks: I am in the process of releasing a tutorial for the Task Manager, it should be out soon hopefully.
For safespotting: It seems that in your case the script is retaliating to npcs only, and once there is no aggro it can't find the npc. Did you enter the npc via typing the name or via the add npc button (and arrow keys)? Which npcs are they? I will help ASAP.
Activated trials good luck guys!