Adobe digital edition bug that’s been around for years no matter witch version

When you borrow a e-pub book with the v3 up to the lattest v4.51... you can't open your e-books on the kobo reader... everything is blacked out... unless you download a pdf file from the same library with a date that is after the last e-pub. Here is an exemple i've downloaded 6 epub books that are due by july 4 and can't open anyone of them ... i alway's have an error message... if i download the next day a book thet is a pdf then magically all my e-books open... it is a know issue since v3 can you fix that bug... i have tried this on many readers (12) and it's always the sane bug with epub files .. no mather with version of digital edition is installed.