Using the kio_slave for Ark on Ubuntu 14.04 running KDE 4.14.2 gives corrupt zipfiles which appear to be fine on the originating machine, but will not open in other applications or platforms.

Recent examples:
Creating a zipfile of jpgs produced a file which was rejected by Gmail and would not open on Microsoft Windows.
Unzipping an odt, changing the 

Reproducible: Always

Steps to Reproduce:
1. Right-click an odt file, and select Extract > Extract Archive Here
2. Go into the resulting folder, open content.xml in a text editor (eg Geany), make a change to a content word, and save the file.
3. Select all the files in the folder: Ctrl+A.
4. Right-click > Compress > As ZIP archive
5. Click on the resulting zipfile - Ark opens it, and clicking on content.xml shows the word-change.
6. Rename the file to odt.

Actual Results:  
Opening the odt file in LibreOffice Writer gives garbage contents.
Similarly, zipping files and sending them to someone on Microsoft Windows gives them a corrupt zipfile which will not open.

Expected Results:  
A zipfile which will open successfully in other applications and on other platforms.

Note that doing the zip manually works:
1. Go into the folder of files to be zipped.
2. In a terminal, run: zip -r name_of_zip *
3. Rename the resulting zipfile to odt.
4. It opens fine in LibreOffice Writer, showing the content as expected.
Likewise, a manually-created zipfile opens on Microsoft Windows.