This article applies to:
Windows 10 Creators Update (version 1703, build 10.0.15063.x) interrupts E-Prime’s ability to detect a correct refresh rate.
Detection of a stable refresh rate is critical to E-Prime’s ability to maintain millisecond accurate timing and reliably predict any timing delays or inconsistencies in an experiment.
Later versions of E-Prime (2.0 onwards) introduced the ability for E-Prime to detect an invalid refresh rate. However, Psychmate utilizes E-Prime 1.x which does not have the ability to detect an invalid refresh rate. Users of Psychmate will not receive any warning or error that the refresh rate is invalid. Additionally, Users will most likely be 1 refresh off from what they expected.
SolutionUpdate to a later Windows 10 build (version 1709, build 10.0.16299.x or later). Microsoft has reported that this behavior has been fixed in the Fall Creators Update.
BUG FIX: "Unable to obtain a valid refresh rate" error occurs when attempting to run E-Prime under Windows 10 Creators Update 
BUG FIX: Windows 10 Creators Update interrupts E-Prime’s ability to detect refresh rate 
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