digital editions wont let me read my purchase anymore

[#1]

it was working for awhile now stopped and says

RET_RECORD_CORE_INVALID_CLIENT_CERT

i paid for this book a month ago or so and i'm only half way thru very frustrating trying to find an answer

Help!

[#2]

Dear Amanda,

Is this related to Adobe Reports and Analytics?

Thank You

Arun