Hi järfällahusa18040632 ,
Thanks for using Adobe Acrobat DC. Really sorry for the issue that you are facing with this.
1) Can you please Share the snapshot of the error dialog that comes up ?
2) Also, does the error comes up / Content disappears, only while saving the files only or is it something that happens midway of doing any operation on the pdf's as well ?
3) Is the issue prevalent with a certain type of PDF files or its just generic with all types of PDF's that you work on ?
Were you ever able to get a resolution to this? We're fighting the same issue, but as of yet haven't come across any fixes.