Adobe Arobat DC,clash if I open 2 pdf files.

Hi 康則行,

Thank you for reaching out.

Adding to the above suggestions.

Please share the Acrobat version number. As the application crashes on opening the second PDF, please check if this happens with all PDFs you open or with some particular set of files.

Did the issue started recently? If yes, did you make any changes recently?

Thanks,

Meenakshi

Can you give us more details?  Are you on Windows or Mac?  Is this issue with just specific PDFs, or any file?  Can you tell us if there is an error message (maybe translated to English for me, at least)?  The more you can tell us, the better chance of finding a solution.

My best,

Dave