[CWIZO]

This is very surprising to me. I've got a kindle from 2013 and never had any issue with unsupported books.

Is yours super older or what?

[tcmart14]

There are some books that just straight up are not supported on kindles or only on Kindle fire editions. Looking it actually recently changed, but "Operating Systems: Three Easy Pieces," you could buy in kindle format, but it would only work for the Kindle fire editions. Maybe it has gotten better, but I used to run into this a lot with textbooks. Would work on Kindle fires, but not paperwhite.

[mtlmtlmtlmtl]

It's a Kindle Paperwhite. I think colour is usually the problem. Doesn't make sense to me either.

[ace2358]

Colour?! I’ve never had an issue of my kindle with colour! It’s only black and white! How can Amazon screw up a black and white conversion?

[mtlmtlmtlmtl]

Maybe I'm wrong. I kind of just abduced it because it was the only plausible reason I could think of. My kindle only supports black and white. And I figure newer models might have colour support?

[wizzwizz4]

The OS has a full-colour graphics library. It converts to black and white on the device. That's not the issue.