ESRI has posted a knowledgebase technical article about the problem. It appears to be related to McAfee or Avast antivirus messing with certain registry entries. See 41057 - Tools open with blank dialog windows Solution or Workaround If McAfee is currently installed and must remain in use, contact McAfee for assistance. If McAfee is installed but not required on the computer, then uninstall it before proceeding with the solution below. After McAfee antivirus software is uninstalled, follow the steps below to resolve the issue. Download the McAfee Consumer Product Removal Tool (MCPR) and refer to the instructions: How to uninstall or reinstall supported McAfee products using the Consumer Products Removal tool (MCPR). Navigate to the directory where the MCPR file was saved. Right-click MCPR.exe and select 'Run as Administrator'. Follow the prompts. When the message is received 'CleanUp Successful', restart the computer.
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