Problems with 2nd monitor

Dear all,
until few days ago I was able to use the second monitor very well. All stimuli were presented simultaneously with the experimenter's monitor. Today, this is not the case. I have big delays which do not allow to perform the task on the second monitor. The strange think is that if I select the option "forced use of fallback screen" everything works well.
Do you have advice to solve the problem?
P.S. I tried also by using a different second monitor but it does not work as well.
Thanks
Marco

Unless you changed something in the NIMH ML settings, it is unlikely to be related to NIMH ML. Check carefully what has changed in your computer for last few days. This kind of issue is usually a problem between the video card and Windows.

If you changed something in NIMH ML, try deleting all configuration files (*_cfg2.mat), including monkeylogic_cfg2.mat, and restarting NIMH ML.