Thank you all for your helpful answers. I have the same problem in Singularity as in the latest version of Firestorm.
However today I uploaded clean installation of SL client and after another test poseball seems to work.
I will try to make another clean install of other viewers and see if it helps.
Reflections are still the issue. I've tried all latest viewers (Singularity, Firestorm, SL client), i have ultra settings on with antialising on 16x, everything on max and taking snaphots of 5000x3000. Mirroring reflection is simply useless pixelated sadness.
I tested the same specs on other computer with one of the best graphics cards on the market. On old Firestorm version 3.sth sth mirroring reflection was superb. But as soon as I updated to the latest version of Firestorm I have the same problem. The quality is to cry for.
I shall make some more tests with old Zen viewer and Nirans viewer to compare them with latest versions of SL client, Singularity and Firestorm.