Alignment cannot be used with a created cell format.

[DevonReynolds]

In the styles.xml, excel seems to expect it to be alignment then protection. With the creation of a new cell format it always creates the protection which will always put it before the alignment. If I change the code to force create the alignment before it creates the protection in the create method it "fixes" it but I don't' think that's the correct approach.

What excel expects

What openXLSX creates

In the demo10.cpp file, the cell format is copied from a cell that doesn't have a format. This bug doesn't effect the format when created this way.

[aral-matrix]

Your title is not entirely clear - am I understanding correct that you have the same issue here where Excel complains about the sequence of XML tags, like in the borders issue #304?
I really want to do something painful to the responsible Microsoft "developers". This has "intentionally breaking compatibility" written all over it.

[aral-matrix]

as per #304, I have (hopefully) fixed this today with 77f4370 and would appreciate some testing.

[aral-matrix]

Patch has been merged into master. Please report any other such issues you may find where MS Office complains about a "wrong" sequence of XML tags.