My ipad 1, WIFI 16 GB worked perfectly for 11 months until I upgraded IOS 5.1 on February 22 ... I have been pulling my hair out ever since ... constant crashes of both IBooks and Safari, incomplete syncs, no sync of books and that ever loving "kiss of death black line" ... through both pdf and e.pub files. I only use the IPAD for 2 things ... reading books and internet surfing and the only application I have added is IBOOKS so there shouldn't being conflicts ...
Yesterday, I went ahead and upgraded Itunes to 10.6 (40). Once update was complete, I downloaded the new IBOOKs 2 through ITunes ... of course it wiped out all of the books I had on my ipad and then I couldn't get the stupid program to even open. Since I can't sync any books, I have another Apple paperweight ... just like my Time Capsule. After numerous resets, completely deleting IBOOKS from IPAD, etc. I finally decided to try a direct download to IPAD ... skipping ITUNES. Talk about slow ... I finally gave up at 4:30 a.m this morning.
At 9:30 a.m. this morning, I was shocked to find that IBOOKS 2 was on my IPADand it opened although it was slow. I downloaded 10 books directly to IPAD ... 5 pdf and 5 epub ... no problems ... worked like a charm so I decided to try a sync of 10 more books through Itunes. You got to love that KISS OF DEATH BLACK LINE ... same old crap.
It's definitely software related ... too much for my 56 year old, menopausal mind to handle ... it brings back "unfond memories" when I used to use PC's and Windows ... If any comes ups with a solution ... please post. Until then, I will downloaded directly to IPAD and avoid using ITunes sync.