I've installed sqlexpress library v. 3.2.01
after the excution of  few statements I lost connection
to MySql DBMS (with new and old ODBC drivers)
with old library 3.0 it's all ok

this is my function to connect to DBMS
L_Connection := "Driver=MySQL ODBC 3.51 Driver"
L_Connection += ";UID=airsoft"
L_Connection += ";PWD=mypwd"
L_connection +=" ;server=localhost"
L_connection +=" ;database="
local_conn := SQLConnection():new()
if .not. local_conn:driverConnect(nil, L_Connection,.t.)
// test also with ==>  if .not. local_conn:driverConnect(nil, L_Connection,,.t.)
    return .f.
endif
return .t.
in this way I install only the ODBC without configure it (it's better
for my customers).
to work now, I must create a System DNS ODBC
and configure it with 'enable Auto Reconnect'.