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Please let us know the dot version of OS installed on your system.
Is this issue occurs with a particular PDF?
Have you tried once to uninstall and re-install application?
If not, try to uninstall (If on Windows, use Acrobat cleaner tool Download Adobe Reader and Acrobat Cleaner Tool - Adobe Labs ) and restart your system.
Then re-install the application from here: Download Pro or Standard versions of Acrobat DC, XI, or X
I thought about doing that, but i am have multiple copies of the pro version and i do not know which serial key belongs to who. But like i said before, the same problem occurs on different computers as well. From my own knowledge, everything was create from Adobe XI Pro and edited by it as well. Everything was working fine but now i'm not sure what's going on.
This document currently has 24 pages total. I notice that if i delete 3-5 pages then the document would work fine with the edit. This happens on other documents as well with over 20+ pages. But with around 15 pages, it's almost a guarantee that it would work fine.
I am running windows 7.