Significance: RIM delivered its latest blow to shareholders and loyal users, warning of an operating loss for its fiscal quarter. The BlackBerry maker’s problems mount up, but its predicament is not unique. Other, larger players failed to update their mobile platforms in time to counter the rise of iOS and Android, Nokia being the key example. And almost every company whose mobile business relies heavily on a business base is in big trouble on the device side, because in the world of BYOD, corporate users choose the same gadgets as consumers. That has hit the ‘post-PC’ ambitions of the big PC makers like HP and Dell, which now have to live with falling growth in their core devices and nothing…