Yes, we have fixed this bug in version 6.
If you are using old version 5.6, and you just want to sort alphabetically, please use the Edit menu option to sort the child topics alphabetically. This is very fast. The trick is, if you want to sort all the topics alphabetically, you must have no topics selected (use Ctrl-Click to deselect).
In version 6, we have made this easier by giving two separate menu options to sort the children or sort all the topics alphabetically.
