Bugs of this sort can crop up at any time. Unless people report the bugs to the developers, they won't get fixed. When you came to the conclusion that this is an old problem... yes. The basic problem is one of translation - the translation of one word processing file format (a.k.a. "markup") to another. However, the error is not likely to be the same one that people reported years ago - it's just the same category of error. This commonly happens when a developer enhances their proprietary markup language with new commands. Effectively, they just invented a new word, and the translator is unfamiliar with it.
In medical terms, many diseases may have similar symptoms. They may all get lumped together into a single category, like "stomach flu." However, when you look at them under the microscope, you see they're different.
You can blame Microsoft, or you can blame Apple, but unless you know exactly what happened in each specific instance, you can't know who is truly to blame.
I think people have found your anger to be off-putting. It sounds like the Queen of Hearts shouting "Off with their heads!" Programs are still crafted by human beings, and humans are fallible. The more people who use a program, the more likely that bugs will be found and squashed, but in a world filled with monkeys with typewriters, it's still likely that some rare, odd combination of keystrokes and settings will uncover a new bug. You can rage at the darkness, or say, "C'est la vie!"
