All,
The admins have identified some miscreants attempting to hack some user accounts.
They have (temporarily) installed a plug-in that requires users to enter a 6 digit 'captcha' code when logging in as a security measure.
As I say, it should be a short-term measure, so please bear with it while necessary.
PS - I am actually "off-duty" in India right now, back mid-May.
PPS - Diver_Dave, check your PMs
SD