The ability to “always center on active glyph” or drag the preview area back and forth in edit view has never worked properly in Glyphs 3. But in 3.0.4 (3108) it is especially bad. When I turn off “always center…” it doesn’t always work, sometimes the text just jumps to the left side of the window. If I then turn “always center…” back on the text disappears. To get the text to reappear I turn off “always center…,” but the text remains stuck to the left. To get it working again I have to restart Glyphs, and it stops working correctly as soon as I disable “always center…”
It works ok for me. I saw some minor jumping with very fare shifts. I just added the option to reset the manually shifting by double clicking in an empty area.
Can you show what is not working as expected?