If you have your own VBA scripts in KeyLAB input sheets for importing data from external files you may find that they appear to run very slowly. This is becuase KeyLAB monitors sheets for changes in order for calibration and graphing functionality to work correctly. A side-effect is that Visual Basic macro code will not operate as expected when modifying 'Application.ScreenUpdating'.
The following steps will temporarily prevent KeyLAB from handling sheet changes and allow assignments to Application.ScreenUpdating to be effective.
Application.ScreenUpdating = False Range("Change_Monitoring") = "False"
' Your code.
Range("Change_Monitoring") = "" Application.ScreenUpdating = True
Always ensure 'Change_Monitoring' reverts to a value other than 'False' after screen updating is resumed.
This feature requires KeyLAB version 2.1.2.12 or later.