I had this problem last week too. I read the FAQ associated with technical requirements on the EPC website. It suggested cleaning out the cache in the Java console which in Windows 7 is located in your control panel.

I did this - no luck. I uninstalled Java, then downloaded again using the links at the bottom of the EPC tech requirements page. I immediately updated Java to version 6.33; after all this, EPC worked again.

EPC failed a few days ago again so I cleaned out the Java cache. This time that did the trick.

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Brad Cushman
'73 450 SL