I have on more than one occasion fizzled casting the spells "lightning", "paralyze", and "energy bolt" while at GM Magery. I'm certain that it was a fizzle. Here's a screenshot of a fizzled energy bolt.
Can't be sure it's the same thing but I've also had the fizzles. They are a RunUO bug (had it happen on other shards also) that is something to do with performing and action and targeting at the same time. I'll often get it when I'm spam left clicking as the target comes up.
Interesting. I will look into this. All players should be able to open a locked down container. A lot of trammel to remove from housing. This will be reviewed and fixed. A review of the UOR patch notes should be checked to see if they changed it at some point. Otherwise if someone can determine a situation where this can be reproduced this would be a huge help.