I tried this 3 times, and I can’t use the Notes plasmoid and Konqueror at the same time. I was able to get Konqueror working again by restarting, but if I enable the notes plasmoid it just crashes on startup. This is for Tumbleweed release 20171218 ~Aletheia
Konqueror works fine here (I use it all the time), even though I do have a notes plasmoid on my desktop. (I wouldn’t really see a possible connection there anyway…)
What error message do you get if you run konqueror from a Konsole?
Try running “zypper dup”, maybe your system is not fully up-to-date.