If you select the Browser plugin,
open a connection (click on "+" or double-click in the Entries list) and
than press any key,
the list greys out and luma needs to be restarted.
The bug has been introduced due to a typo by svn-commit 592 on 2005-04-01.
And has been released with Luma 2.2
Typo: "keyTex" instead of "keyText"
SVN-commit 601 introduced a related bug:
itemClicked is called with wrong parameters by keyPressEvent.