CalibrateEyeLink will turn on and then turn off stimuli quickly left an empty screen

[yfcc]

stimuli turned off at line 171

In my current working version (lab 2.2.5, version 2.5.0b1-37-g88c52b5), this line is not there.

[joschaschmiedt]

The change you mention was introduced to allow for randomness in the function that generates the stimuli and give more manual control to the stimulus presentation (click "S" to display the stimulus). As this change seems to be controversial, we'll probably add a checkbox to switch between automatic/manual stimulus display.