The "Uninstallable" and "Debcheck" columns for non-free packages are out-of-date.
See for example http://qa.debian.org/developer.php?login=joachim.reichel@gmx.de .
The columns look as they did before the release of etch, i.e., the stable
column of both properties refers to sarge. The package core++ existed in sarge
only for i386, the cgal package did not exist at all. But the "Uninstallable"
column of stable should be the same as the one for testing. Similar for the
"Debcheck" column.
(It would be nice if the Testing/m68k problems could be filtered from the
debcheck reports.)
Joachim