Particles rendering must be switched off

I have a problem in my viewer. Since a few days, if the Particles Rendering is switched on, blue or red "clouds" are emitted by objects (avatars included) which makes an action (move, pressing enter during chat and so on). Tha "clouds" have the shape of a six sided pyramid, when emitted they are small and dense, they are mooving upstairs, their size is increesing, and during this they become transparent, then they disappear.
I tried with two avatars, the result is the same. Removing and reinstalling the viewer doesn't help. From other computer, using my avatar the phenomenon is naot appearing.
Does it know somebody, which setting is wrong in my viewer?

You have enabled , show avatar updates in debug (or the shortcuit wich i cant remember wich is) then you get those.

ty, it helped