For a week or so, the Ctrl+C mapping does not send an interrupt, but opens a new tab with another profile. It might have happend around the time when there were updates for all KDE software.
I start with a single tab with the Solarized color scheme:
Then I press Ctrl+C and get a new tab with a different profile:
However, if I press Ctrl+Shift+C, I get the interrupt:
In the settings, it seems all fine:
How can I get it back to have Ctrl+C send an interrupt and Ctrl+Shift+C copy text?
I experienced the same frustrating behaviour. While poking around I found that I had a profile mapped to a key combination that included Ctrl+C.
If you haven't already, you might want to check your profile short-cuts under
Settings -> Manage Profiles
.