Christian, Tony,
if I understand correctly there are actually two problems. First like I have 
described and second one is that internal diff should be used starting 
v8.1_0360.

I did the following:
a) I started gVim:
   c:\Programs\Vim\vim81>c:\programs\vim\vim81\gvim -u NONE

b) Checked which scripts are loaded at startup:
:scriptnames
and the output is:
1: c:\programs\vim\vim81\menu.vim
2: c:\programs\vim\vim81\lang\menu_sl_si.cp1250.vim
3: c:\programs\vim\vim81\autoload\paste.vim

This is fine, my _vimrc file was not loaded, just
pure vim files.

c) Checked what is default diffopt value:
:set diffopt?
and output is:
diffopt=internal,filler

d) Executing commands:
:cd c:\aaa
:e a.txt
:vert diffsp b.txt

and I am getting the "E959: Invalid diff format".

e) Executing:
:set diffopt+=internal
pressing enter and diff is working correctly!!!

f) Rechecking diffopt
:set diffopt?
and output is:
diffopt=internal,filler

g) Just in case checking diffexpr
:set diffexpr?
and output is:
diffexpr=

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