Usability practitioners invest much study, time, and effort in clearly, conclusively documenting usability problems. So it can be a little shocking to deliver a carefully researched report, steel yourself for argument or denial, but instead hear the impatient response, "Okay, then, what's the solution?"
In business, you should not raise problems without a solution. Even specialized usability test engineers are likely to be asked their opinion on fixes. At this point, however, you're stepping out of strict usability and into the creative sphere, a space you share with designers, developers, and product, among others.
Recommending a solution to usability issues is easier with training in cognitive psychology, human factors, or human-computer interaction. With the right background, you can identify exactly what part of your audience's needs is not being met. It's also necessary to be creative, a process not ideally suited to businesses run by the cliche, "if you can't measure it, you can't manage it." Some organizations quantify their usability tests as much as possible, but you can't always quantify possible solutions.
The old business process is changing, however. Businesses are waking up to the unique value of creative ideas and they are helping creative flow happen. Finally, sometimes you just need to get lucky, which itself is also a process often dependent on consciously creating fortunate circumstances.