Hi,
I created two identical files a.txt with content:
aaa

and b.txt with content:
bbb

I have downloaded 
https://github.com/vim/vim-win32-installer/releases/download/v8.1.0369/gvim_8.1.0369_x64.zip
so latest master and installed on Windows 7.

Then I opened Command Prompt and:
c:\programs\vim\vim81\gvim -u NONE

In gVim I did:
:cd C:\myfolder
:e a.txt
:vert diffsp b.txt

and I get an error:
E959: Invalid diff format.

Pressing Enter and diff does not work.

I reverted gVim back to 8.1.0301 and diff works fine.

Any idea what is wrong? Where there some changes effecting diff?
I can ping-pong the version when this first appears, but it would take some 
time,
so I would like to know if this is already known problem.

Can someone else reproduce the problem?
Regards

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