When I select a few files, and change the sort order (from Name to Type), those selected files are then "lost" (no longer selected). This happens with both files of same 'type' (say .zip files), or a random selection of files different types.
This does not seem to happen when changing to one of the other sort types (Size, Modified, Attributes).
Haven't tried all of sort types but it does seems to do this consistently with both v2008.06 & v2007.10a, across directories containing files of mixed & same type.
-Dennis