What is this help pleaseee theres wierd lines when i try draw using pen tool

[shattered_9022]

I have no idea what it is but ive attached photos any idea how to turn this off or anything thanks 

[davescm]

That's not the pen tool, it is the pencil tool, but regardless your screenshot shows all the signs of a GPU that is glitching. I see you are on a MAC and I believe driver updates are managed by Apple. Is your system up to date?

Dave

[shattered_9022]

Hi dave thanks for letting me know but to my knowledge it is fully upto date but ive never used photoshop before and am not sure if i need to turn something off . Update i clicked something it said i need to resize the layer or something and now its normal thank you for the help tho

[shattered_9022]

Oh never mind its back but i dont think its a GPU thing becuase i can press undo and it undoes it like it was an edit along with the lines

[davescm]

Try this in this order

With the pencil tool selected, go to the top left of the options bar at the top of your screen and click the small down arrow next to the tool icon. Now click on teh small cog icon and choose 'Reset Tool'

Did that help?

If not, go to Preferences > Performance and turn off Multi threaded compositing.
Close and Restart Photoshop.
Did that help?

If not, turn Multithreading back on again and this time go to Preferences Technology Previews and check 'Older GPU mode Pre2016)

Close and restart Photoshop

Did that help?

If not turn uncheck older GPU again back on again and this time go to Preferences Performance and uncheck 'Use Graphics Processor'

Close and restart Photoshop

Did that help?

If not , turn it back on again, restoring all back to original and close and restart Photoshop.
Then go to Photoshop's system info and click 'Copy'
Then paste the info here.

Dave