Colourblind watermelons
> When your monitoring dashboard is a sea of green, but the phones are ringing and the directors are on your back, you have a watermelon problem.
You may just have a colourblind operator on duty. Seriously, this is probably the most easily avoidable design choice issue in IT. It's the single most common form of colour blindness and if you count CB as a disability, deliberately making your systems hard to use may even be considered discriminatory.
A lot of companies are, finally, starting to make their websites more accessible - though the increasing use of Flash doesn't help at all. Maybe it's time companies started to consider the access issues to their internal processes and tools as well. After all, if you care more about marketing to anonymous customers than you do to looking after your own employees, what motivation is for the workers to "care" back?