McAfee prevent Word from starting correctly when the Citavi Word Add-In is active.
We have notified McAfee of the false positive alarm several times without receiving a response so far.
Until McAfee improves its checking routines, two rules need to be disabled in McAfee.
1. In the McAfee main window click Threat Prevention.
2. Click Show Advanced.
3. Scroll down to the Exploit Prevention section and further to Signatures. Enter Word in the Quick find field. Two rules are displayed for which the check mark under Block needs to be removed: 3754 and 3821.