When text is marked for redaction's, Adobe crashes. This occurs on every desktop and on every PDF we try to redact.
Sorry for the delay in response to your query and apologize for the inconvenience caused. Please check for the latest update of Adobe Reader from Help menu>Check for updates. You may also download and install the updates manually from Overview — Acrobat and Adobe Reader Release Notes
Restart the machine after the installation of updates. You may also try to repair the installation files of Reader from Help menu>Repair installation files(only for Windows).
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