An old guy I know had some trouble with his email. A sidebar in the web interface wasn't loading. To look at it, he sent his login information to me via email so I could check it out. It's not as bad as it sounds. You could crack his password with an abacus, so doing that didn't significantly decrease security :^/
I took a look at it, and it appeared ublock was blocking some of the content. There's a bug with how the logger interacts with firefox, and I didn't know how to get around it at that point, so I told him to disable ublock on his email page, and included a helpful screenshot on how to do it. I also explained I installed ublock to help prevent malware, so it was implied that it's a Bad Idea™ to globally disable it. Well, he said he tried my suggestion, but it didn't work. Huh... I wonder what he /really/ did...
Try it again a couple days later, and it works fine, even with ublock enabled. I write back to tell him, but he says it still doesn't work for him(???). Says he'll get his daughter to look at it cause she's a computer something or other, and thanks me for looking at it. I don't like being defeated by computers, but am leery of dealing with the humans, so I don't pursue it.
I just got an email thanking me for fixing the issue. Apparently it's working fine now, and I'm the hero. I'll take it I guess. No idea what happened, but I assume it was on the provider's end :^/