[Ti] Finder Icons Won't Move X 10.2

[Daniel W Kegan]

A Mac-using colleague developed a bug in their
10.2. (.1 or .2 ) system this week--
the Finder icons won't be moved,
although mouse/courser can select them.

One web suggestion I found was to delete the
/library/caches/com.apple.dock.iconcache<username>

but that didn't work.

Nor did logging out main user and logging in as
secondary user set up for when main user is corrupted.
Not View> View Options> Grid.

[How delete without working moving icons, pondered--
select, File>Move To Trash, restart].

Fix permissions not a magic cure.
Any knowledged-based or otherwise reasonable guesses,
short of Archive & Install, and if that fails, clean install.

May miss digest response, thus would appreciate also
direct response to <daniel at keganlaw.com> . TIA