While executing an experiment, a run-time error "Internal Drawing Error" occurs.
In most cases, this typically means that a background application is trying to gain access to the display sub-system while E-Prime is running.
PST recommends running with as little background applications as possible during an experiment run that collects data to avoid these types of errors as well as makes for a solid base system for replicable studies.
Finding and disabling the culprit background application can remedy the situation. Under Windows XP, Windows 7, Windows 8.1 and Windows 10 this can be done via the MSCONFIG utility by selecting 'Diagnostic Mode' and then choosing the 'PNP Plug and Play' service. Other sevices and applications may be required per each system configuration. Please see INFO: How to use MSCONFIG to troubleshoot machine configuration and reduce background applications  for more information.
Suspect Background Applications
End-users have contacted PST with information suggesting that disabling the following applications may remedy the "Internal Drawing Error" run-time messages:
• Microsoft Net Meeting
• ActiveSync (Pocket PC)
• Matrox P650 Display Utility
This topic applies to:
All versions of E-Prime