Thank you, Demeter (hope I'm not confusing your name with your family name :) ) . That bug, or what it is, looks pretty old (reproducible in every Blender version I tried - down to 2.61) but only in 2.80 it somehow gained prominence. I consider it critical cause you don't want your character flashing with random mesh explosions during animation and not using b-bones at all also not looks like a good thing. But with 200-300 open unsorted bug reports and few dozens new a day you, developers, sure have your hands full.

I think Pavel experiences a problem with baking fluid simulation in case when path to simulation cache contains Cyrillic (any localized?) symbols when running on Windows 7. That is 'good' is when cache files are created by Blender after hitting 'Bake' where was specified by path given and 'bad' when there is no cache files in the folder after hitting 'Bake'.

AMD R9_290, AMD GPU Pro 16.40 driver, Linux x64
Blender 2.78a, 2-78-bd42987 (20 dec)

Max, please try latest daily build, so Blender devs will not waste time to investigate things that they already solved. I'm not Blender dev - so it's only my humble proposition.

Hi Max!

Hi Sergey!

Hi Mai Lavelle!

2016-12-03 daily build not rendering on my AMD GPU at all, even in GUI mode.

Thanks for the reply. Ok, its understandable. But links to the "forums" or "bf-funboard ML" would be nice thing to share. I created that task because web search for "blender feature request' was very inconclusive.

O.K. than, thanks for your attention to that report, Sergey and Bastien. You never know in advance what is designed to work well and what is just a "hack" or so.

Even confirmed, considering that a very low priority report, because usually workaround is very simple: just not to use "Offset" and "Invert" together - just change roll by 180 deg. for one of interacting bones.

Oh! Fantastic! It's really the case!
In 2.68 all was fine and I was wondering since 2.69 - why people don't see such a salient problem!
With that knowledge this "singularity" will be much less annoying to me!

to rocketman,
yes, adding "extra object" to the chain just gives a clear "dependency cycle"... but behaviour is the same... i.e. my setup is really looks like fake dependency cycle in Blender. And I don't know what to try with "data update" - so I'll just believe that's not helps.