You can disable (or alter) the sorting behavior by overriding the default "order" event handler; for example giving the grid a script like
on order do end
For the record, the default handler currently looks like:
on order col do if !me.locked me.value:select orderby me.value[col] asc from me.value end end
The cell-editing problem was reported by another user earlier today; this will be patched in the v1.42 release tomorrow. The problem is specifically caused by the default "changecell" handler not properly accounting for columns that don't have a format configured.