Hello, i have let my friend to try out my tablet and when i got back, some setting was probably changed, not knowing which. Previously, inking tools were being post-processed giving smooth lines, and now those lines are rasterized. Also the cursor changed, showing a double circle instead of single one.

Here is the sample of line and current cursor of the "Ink Circle" tool:
https://drive.google.com/open?id=0B2gLnE_juw3HbTRBWjljOWtsSWc

I cannot find any option in brush settings which affects it, even restoring default settings and reinstalling Krita did not help. Please help...

Hm...

In the bottomleft corner, there's a zoom slider. Next to that is a odd looking button. Make sure that is pressed. I suspect you accidentally unpressed it, making everything look odd.

Another attempt to fix this could be to go to settings->configure Krita->display and have openGL checked. If that works, then what happened was that your grapics driver got confused, crashes and thus Krita disabled the option automatically for safety's sake.

Thank you TheraHedwig for your prompt answer. You were right. My OpenGL setting was disabled, enabling it solved the weird looking brush cursor. However the lines are still jagged.

To closely describe the further problem:
If I remember correctly, using most of the ink tools before worked like this. A line which is being drawn appeared rasterized (like when using 1px pencil in MS Paint), and in the moment the line was finished, some post-processing magic happened which turned them into fine looking strokes. The latter part do not work for me now.

If I remember correctly, using most of the ink tools before worked like this. A line which is being drawn appeared rasterized (like when using 1px pencil in MS Paint), and in the moment the line was finished, some post-processing magic happened which turned them into fine looking strokes. The latter part do not work for me now.

This only happens with the calligraphy tool. For the freehand tool, you will need to select the proper brush, such as ink_brush_25

For printing work, it is often better to have aliased lines, so hence why we have aliased looking brushes like ink_circle.

I see... Then it was my fault remembering incorrectly

Thank you for your help