I'm still using 188.8.131.52 (Windows) and notice that in Expanded View after collapsing and expanding the active thought I sometimes can't get its child thoughts to be arranged either by name or by type. Some other sort order seems to be used. I've tried going back to Outline or Normal view, rearranging (which works fine), then returning to Expanded view when arrangement returns to random.
This doesn't happen often but can be frustrating when it does. So far I haven't found a pattern but wonder if anyone else has reported this. Forum search turned up nothing so far. This has happened so often that it has to be a bug.