INSTALL_ERROR_DISTRIBUTION_SIGNED_BY_APPLE when trying to buy anything

Hello everyone,
I ran into the INSTALL_ERROR_DISTRIBUTION_SIGNED_BY_APPLE problem today. I solved it by choosing "best try" for OCSP and CRL in the certificate tab of the preferences dialog of keychain access - it was set to "needed, if the certificate demands it" (or something similar - I am using the German localization).
It may be that I had changed this setting some years ago and that this setting was still there after updating to 10.6. But I am not sure if the new setting (best try) is secure - so would please anyone who can use the MAS successfully check what setting he/she has in the above mentioned dialog?
Thanks,
  Dirk

Thanks so much Dirk
I was going crazy trying to understand why both my computers where not able to dowload from the Appstore
You deserve an award!!
Thanks a trillion
Annabelle
P.s
I would like to give you Correct Answer but I can't

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