Origin Ver. and Service Release (Select Help-->About Origin): Operating System:Win10 I made some diagrams in Origin8 days ago. However, when i open it in Origin2019, some diagrams are lock and i can't see them. Anyone know how to solve this?
The Origin 2019 that you are using is Student Version, right? There are some restrictions for Student Version. One is windows limitation. Origin project (OPJ) limited to 30 windows in Student Version About Student Version: https://www.originlab.com/index.aspx?go=Products/OriginStudentVersion
If you can check all window in your Origin 8, I suggest you can split the windows to different projects in the old version. Then open in Origin2019 again.