This project contains a setup to reproduce an ASUS PG258Q monitor bug. This bug moves about 10 columns of pixels from the middle to the left of the screen. There is a thread on this bug on [the ASUS forum here.][1] @[osf](g2a5x) This is photo of the monitor with the problem. Note the word "show". @[osf](nk5tu) This is a photo of the top left part of the monitor with the problem. Because this bug only seems to occur every ones in a while, I build a setup to reproduce the bug. The setup is a USB camera pointed at the monitor and a batch file running an [OpenSesame][2] task a hundred times. This experiment starts in a non native resolution (640x480) and saves an image of the USB camera every run. Use runOnes.bat to create a single image and align the webcam. Use run.bat to really do the test and create 100 images. @[osf](gtnf7) The setup. After completion of the automatic part one can easily go through the images saved and count the occurrences of the problem. This translates into a percentage of occurrences of the problem in that run of the batch script. The data folder contains folders with the images of runs in the following format: [run number]_[percentage the problem occurred] The file *readme.txt* contains an overview of the runs. See https://osf.io/3g2a7/wiki/Installation/ for installation and usage. @[osf](fgjwk) An image where the problem did not occur. @[osf](cj2sf) An image where the problem occurred (white line on the left). [1]: https://rog.asus.com/forum/showthread.php?94621-PG258Q-Line-down-the-middle [2]: https://osdoc.cogsci.nl/