Shadow min bias is the cause of a lot of different kinds of grief. I searched for some posts I've made. If you don't understand this parameter, you don't understand Firefly.

http://www.renderosity.com/mod/forumpro/showthread.php?message_id=3902894&ebot_calc_page#message_3902894

http://www.renderosity.com/mod/forumpro/showthread.php?message_id=3797767&ebot_calc_page#message_3797767

http://www.renderosity.com/mod/forumpro/showthread.php?message_id=3936336&ebot_calc_page#message_3936336

http://www.renderosity.com/mod/forumpro/showthread.php?message_id=3919633&ebot_calc_page#message_3919633

http://www.renderosity.com/mod/forumpro/showthread.php?thread_id=2831427&page=2#message_3820239

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)