When using FCK editor image button, there are broken links for images.
Reproduce with:

1) Upload an image to DMS
2) Open a page, new paragraph "textImage"
3) In FCK, upload a new image from your PC. The link is correct (e.g.: /magnoliaAuthor/tmp/fckeditor/22ba03f1-5b9b-11e1-834c-df984c86872c/banner_FlashSubstitute.jpg)
4) Now save and re-edit
5) In FCK, reference a DMS image (see 1.). The previous correct link now is broken (e.g.: /test/test-section/text/mainArea/013/text_files/file/banner_FlashSubstitute.jpg) but the second (dms) is working.

probably related to: http://jira.magnolia-cms.com/browse/MGNLDATA-143

Update from SUPPORT-1566:

IMPORTANT: use magnolia with site recognition based on domain mapping. Otherwise the bug is not visible.