So, manifest_parse includes:
<verbatim>
        p->rDate = db_double(0.0, "SELECT julianday(%Q)", next_token(&x,0));
</verbatim>

While the tag_insert called in manifest_crosslink() does:
<verbatim>
  db_prepare(&s,
    "REPLACE INTO tagxref(tagid,tagtype,srcId,origid,value,mtime,rid)"
    " VALUES(%d,%d,%d,%d,%Q,:mtime,%d)",
    tagid, tagtype, srcId, rid, zValue, rid
  );
  db_bind_double(&s, ":mtime", mtime);
</verbatim>

While the call at manifest_crosslink() does:
<verbatim>
    prior = db_int(0,
      "SELECT rid FROM tagxref"
      " WHERE tagid=%d AND mtime<%.17g"
      " ORDER BY mtime DESC",
      tagid, p->rDate
    );
</verbatim>

I think that the <tt>%.17g</tt> printf kind of prompt should be moved into db_bind_double, as before. Otherwise there may be rounding problems, like those I am experiencing.

Notice that the tag_insert resulted, in both computers, in:
<verbatim>
REPLACE INTO tagxref(tagid,tagtype,srcId,origid,value,mtime,rid) VALUES(11,1,74,74,'365',2455525.42240741,74);
</verbatim>

While the printf-style SQL queries with <tt>%.17g</tt> had different results in the two computers.