I've had the date thing happen. Not sure why, but I assume it's an issue with task assignment. That particular Sim is being tasked with going to work, manning a shop or booth, or doing a walk by somewhere at the same time they're supposed to be on their date.
The coffee thing I haven't seen, but I haven't actually played Sims in my game in several weeks, not since the Sims started being randomly mean to each other. I've just been working on a build, when I've played at all. I'm not keen on my Sims all hating each other.