"Total eclipse" happens if weather settings are not defined.
This one is not really OpenMW's problem, but I find it worth mentioning.. Russian version of Bloodmoon includes a broken Morrowind.ini without settings for BM weather types (Snow and Blizzard). When encountering this weather, MW complains for missing cloud textures, but then works somehow. In OpenMW everything just fades to absolute black until weather changes. Maybe there should be some fallback for this case? Something like using "Clean" weather settings.
(RM-2841 from redmine: created on 2015-08-10 by Denis Smirnov, , closed on 2018-03-17 by Alexei Dobrohotov)