Pidgin 2.12.0 options dlg does not draw checkboxes

0.4.10-RC-30-g51a70dc
"Pidgin 2.12.0" fram rapps in its options dlg

I reuse screenshots & log from CORE-15322.

Observed result
0.4.10-RC-30-g51a70dc_noCheckboxes

Expected result
xpsp3

I guess 0.4.10-RC-30-g51a70dc_endsAfterUninstallPidginAndShutdownRos.log is rather useless, but you can find where I started and interacted with Pidgin main app by searching within log for "libgtk-win32-2.0-0.dll".