I found a solution to this issue. I emailed the company and they got back to me right away with this response which fixed it immediately.
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This happens with a few people after an update, either because there’s a problem with the database file, or a problem with the app itself. Here’s some things to try:
– run Event Manager X and choose Window > Rebuild Database… in case there’s a corrupt database
– manually update Event Manager X:
• Download the latest version from https://assistedediting.intelligentassistance.com/downloads/Event%20Manager%20X.dmg
• Drag Event Manager X to the Applications folder alias
• Choose “Replace file” when prompted. Event Manager X will be copied into your Applications folder
– manually trash the databases that EMX creates: the databases are in your user’s Library/Application Support/Assisted Editing folder.
• In Finder hold down the Option key and choose Go > Library
• Find the Application Support folder, and inside that the Assisted Editing folder, and inside that trash the files called Event Manager X.yml and Event Manager X.plist