Can't read books on KOBE, ADE crashes when I try to open book

ADE 4.02

iMac 10.10.1

Crashed Thread:        0  Dispatch queue: com.apple.main-thread

Exception Type:        EXC_BAD_ACCESS (SIGSEGV)

Exception Codes:       KERN_INVALID_ADDRESS at 0x0000000000000000

I reloaded ADE & deleted the book and borrowed it again.

Same result.

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Before this books seemed to download ok, but when I bought some books from KOBO some of the library books disappeared and others would only display table of contents, and would exit when I hit next page.  Not sure what version of ADE I was using then.  KOBO suggested I install 4.0, but sent me a link to 3.0 and I tried both.  I called asking if I could return the KOBO and they walked me thru deleted both KOBO and ADE and reinstalling over several hours and borrowing more books, and it crashed.  I tried several more times re0initialing my reader but not the 2 apps, and restarting it several times (was actually trying to get it to reset) and it finally started working until I tried to borrow this book.

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KOBO now says it is an ADE problem and won't help me with it or let me return it. (Wish I had got a Kindle)