This article applies to:
E-Prime Extensions for EyeLink 3.0
The backdrop specified in ELTrialBegin or ELStartBlockRecording's vBackdrop parameter does not display on the Host PC during a trial.
A backdrop does not display on the Host PC when the size of the image is greater than the display resolution of the Host PC.
Verify that the size of the image is smaller than the display resolution of the Host PC. If the image is bigger, open the image in an application such as Microsoft Paint and resize the image.