Overlapped I/O Event is not in a signaled state

[gavanm307679]

Why do I keep getting this when trying to add an attachment to a PDF. I have tried 10 different PDF files and I get the same message for all. I have Adobe Acrobat Pro. I have searched everywhere and cannot find a solution to this, there is also nothing on Adobe Community to help me with this issue.

[Abambo]

This looks like a Windows error message.

What is your Acrobat and version? What is your Windows and version?

[gavanm307679]

Sorry, I did not realise I had any replies.

I spent hours on the phone to Adobe, rolled back to a version from Novemner 2023, all was good and now its happening again. Can not attach anything.

Windows 11 Pro and Version is 23H2.