Bill, that is a PERFECT example of why most companies do NOT get software period: they never bother to test how their software works when in the hands of those who are not technically savvy. In regards to Opera I think it's more of a reason than an excuse: resources. Opera 12 final shipped with the full file menu not working with themes because the developers never bothered to change the toolbars in spite of the fact that Opera's GUI is almost entirely superior to Firefox's ability to customize (with two glaring inabilities remaining). However like a lot of bugs I've mentioned it'll get fixed within a reasonable amount of time because the Opera developers do seem to genuinely care and as I am trying to point out every other browser vendor has a lot more resources at their disposal.
You will on occasion hear someone boast that their parents have no problem with something (and in reality they are more technically savvy than their loudmouth child who thinks they know more than you) though it comes down to this: designers. You see Balmar jumping up and down on stage screaming "developers!" but developers don't understand people, they understand code and most developers are not designers. I was unable to change the DPI on a computer infected with Windows 7 for a neighbor because Microsoft is so far off course from any concept of good design that if they find anything not yet broken they jump to break it (e.g. the Windows 8 hostility towards the start menu). Not sure if you thought I was blaming open source in any way as it seems implied for your reply, I was not; only inferring that open source is capable of gathering more resources than Opera can (even though Mozilla has a stranglehold and has been actively destroying Firefox for years now).