Frustration is being so lucky as to win not one but two eBooks by an amazing author but be unable to read them because of formatting issues (as in format [square] meet eReader device/program [circle]).
Frustration is also deciding that an eBook won earlier this year that you can't read (please see above frustration) shall be purchased only to discover that said eBook has been released in every format (or at least it feels that way) except for the one required.
And frustration is also realizing that after 2 years of blogging I will have missed my self-imposed number of posts per month :( I like to aim for 10... Then again I could cheat and write two posts tomorrow and just date them 31 December...
So, what frustrates you about eBook formats/devices/programs or...anything?
Edited to add: Frustration is also realizing that even on annual leave finding time to blog-hop seems impossible...and I don't want to let anyone down by not visiting.