I believe they have only happened when Chrome was open, and no, I can't see any programs installed around that time. I already went through the process you put in that last post a couple times, and the frustrating thing is that lodder.club does NOT have the option to remove!
----------------
Oh, dear. I may have been wasting your time, not to mention my own. I just went and looked again, and realized that I had always been RIGHT-clicking on the three dots. Ummm. Left-click *does* give the option to remove.
Ugh. So it seems that ---may have--- removed it. We shall see.
Now I am just shaking my head. Seriously? All this week-long hassle because I saw the word "right" where it wasn't? Sigh.
Hopefully, this will do it. Fingers crossed!
Seriously, you guys are amazing. Thank you!