This has been making me crazy. It’s WAY too easy to accidentally enable loop when navigating or using the ruler. At NAMM this year, one of the Steinberg guys I spoke to rolled his eyes and said “I know, believe me, I know” when I asked him about it.
Please fix ASAP. It’s a poor, clumsy design that was well-intended but needs to - at the very least - have the option to not enable loop by clicking in the upper half of the ruler. Hard to believe this has been in Cubase for as long as it has without being addressed or made an option to turn off.