Fix Mac Cannot Open PDF in Acrobat After Mojave Update
Question details
The user is unable to view PDF files in Adobe Acrobat after updating their Mac to macOS Mojave, even though the files successfully open in other applications like Illustrator.

- Product
- Adobe Acrobat
- Device & OS
- macOS Mojave
- Scenario
- Attempting to open a PDF document using Adobe Acrobat on a Mac immediately following a system update to macOS Mojave.
- Observed behavior
- The PDF file appears to open in the background or fails to display on the screen entirely within Acrobat, despite functioning normally in other creative applications.
Ensure your Mac has completed all secondary macOS Mojave patches and try completely quitting and restarting the Adobe Acrobat application before attempting to locate the hidden window.
Recover Hidden Document Windows Using the Cascade Tool
Use the Acrobat Window menu to bring hidden or off-screen PDF document windows back into the visible desktop area.
Sometimes, OS updates can cause applications to miscalculate screen coordinates, resulting in the document window being loaded entirely off-screen or hidden behind the main application frame.
Launch Adobe Acrobat and attempt to open the problematic PDF file as you normally would.
Navigate to the top menu bar on your Mac, click on 'Window', and then select 'Cascade'.
If 'Cascade' does not bring the document into view, go back to the 'Window' menu and select 'Tile' to force all active document windows to arrange themselves on your screen.

Verify Application Updates and Reset Preferences
If the window layout tools do not reveal the PDF, updating the software or resetting preferences can fix deep-rooted Mojave compatibility bugs.
View and Edit PDFs Seamlessly with WPS Office on Mac
If Adobe Acrobat continues to have compatibility issues with your macOS, switch to WPS Office. It provides a lightweight, highly compatible PDF reader and editor that works perfectly on Mac without hidden window glitches.
- 1. Download WPS Office: Visit the official WPS website and download the macOS version of WPS Office.
- 2. Open the PDF tool: Launch WPS Office and click on the 'PDF' tab on the home screen.
- 3. View your document: Click 'Open', select your PDF file, and enjoy a seamless viewing experience without hidden windows.

Frequently Asked Questions
Why do my PDFs open in Illustrator instead of Acrobat by default on Mac?
macOS might have changed your default application associations after the Mojave update. To fix this, right-click any PDF file, select 'Get Info', choose Adobe Acrobat from the 'Open with' dropdown menu, and click 'Change All' to apply this setting system-wide.
Can a macOS update completely stop Adobe Acrobat from working?
Yes, major OS updates like macOS Mojave can introduce significant compatibility issues with older versions of Acrobat. You may need to download a specific software patch from Adobe or upgrade to a newer version of the software to restore full functionality.
How do I fix a PDF that opens completely blank on my Mac?
A blank PDF is usually caused by rendering or graphics acceleration issues. Open Acrobat's Preferences, navigate to 'Page Display', and try disabling 'Use 2D graphics acceleration'. If the issue persists, opening the file in a reliable alternative like WPS Office can bypass the rendering error.




