Altera internal error problems

Hi all;

I have previous problem that still cannot solve. I have try to use the new version of quartus2 but the internal error still occur.

I also have try to delete the db and db_increment directory but still not work. The compilation is work for the first time, before I turn on the Generate Value Change Dump File Script option (Assignments>Settings). Below is my code and the internal error:

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library ieee;

library ieee_proposed;

use ieee_proposed.fixed_pkg.all;

package my_data_types is

type sfixed_array_t is array (0 to 3) of sfixed (9 downto -8);

end my_data_types;

library ieee;

library ieee_proposed;

use ieee_proposed.fixed_pkg.all;

use work.my_data_types.all;

entity reg_one is

port (clk: in bit;

Ra: in sfixed_array_t;

out_Ra: out sfixed_array_t);

end reg_one;

architecture reg_one of reg_one is

begin

process(clk)

begin

if (clk'event and clk='1') then

for i in 0 to 3 loop

out_Ra(i) <= Ra(i) after 10ns;

end loop;

end if;

end process;

end reg_one;

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Internal Error: Sub-system: WSC, File: /quartus/neto/wsc/wsc_port.cpp, Line: 514

m_port_info.num_of_dimensions() == 1

Stack Trace:

0x251D8 : WSC_PORT::bus_member_index + 0x88 (NETO_WSC)

End-trace

Quartus II Version 8.1 Build 163 10/28/2008 SJ Web Edition

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Can anyone helps me please..really need helps. Thanks