follow the steps in of the second & third problem descriptions in comment 0 of issue #56098, this results in the 'unknown source' dialog being raised
marking as regression, note: this is on master ( not 4.0 )
I confirm this on master of January 17, 2013.
FYI: during testing of the fix for bug 56098 (December 22/23, 2012) on a then current master set, this bug was not yet there.
I'm going to take a look at least at this
I'm pretty sure that http://cgit.freedesktop.org/libreoffice/core/commit/?id=2fe852386c9450014f84910b0a282d684f40b56a
is the culprit
Stephan Bergmann committed a patch related to this issue.
It has been pushed to "master":
fdo#59515: Typo CLIPBOARD -> PRIMARY
The patch should be included in the daily builds available at
http://dev-builds.libreoffice.org/daily/ in the next 24-48 hours. More
information about daily builds can be found at:
Affected users are encouraged to test the fix and report feedback.