When I add a new Paragraph (ncaTest) having a Dialog with two i18n-enabled checkboxSwitch controls, they just are set initially (on first save of the dialog) for each language and need to be set using the JCR browser afterwards. So, unchecking/checking the checkbox does not impact the JCR content AND the opening of the Dialog at a later time.

Problem was encountered in my local setup (Eclipse IDE) and could be reproduced on demoauthor:
http://demoauthor.magnolia-cms.com/demo-project/de/about/subsection-articles/

1. add new dialog (attachment ncaDialog.xml)
2. copy a paragraph and set its dialog to the new created from xml.
3. add paragraph to an area and edit, change values, save and check.