ACS Publisher Signed problem

Hi
I try to sign a SIS file with ACS Publisher.
I do the following process but the created file is not signed (checked with VerifySymbianSigned_v2.3).
Here is what I do:
Choose the certificate in IE (Trust Center Cert).
choose "export"
choose "yes,export the private key"
the PKCS #12 option is now enabled.
"enable strong protection" is marked
other fields unmarked.
press next, put password (also tried without pass), choose file name (cert.pfx) and get the successfull message.
Now I put the created PFX file where vs_pkcs exists and use this command:

vs_pkcs -p12 cert.pfx -passwd thepass -cer cert1.pfx.cer -key cert2.pfx.key

I get the Succeeded message.
now I use this command where my SIS file exists:

signsis myapp.sis myapp.sisx cert1.pfx.cer cert2.pfx.key

this goes without errors but verify results are:
------------------------------
File format : SISX (V9)
SIS file : myapp.sisx
------------------------------
Symbian Signed : No
Developer Certificate Signed : No
ACS Publisher Signed : No
Unknown Certifictaes : 1
------------------------------

Please advise: what could be the problem?

Thank you very much