How to reproduce (on a DS1052E with firmware < 2.4 here): - Use a function generator to put a sine wave on CH1, a rectangle waveform on CH2. - Start PulseView, select the detected DS1052E. - Press Run. - The two waveforms (sine + rectangle) should be displayed correctly. - Press run again and again... - Eventually, after several correct runs, it can happen that there's one run where the data is *not* correctly displayed anymore. - In this specific case it was observed that the CH2 data would no longer be a rectangle but rather "maxed out" (hanging at a high voltage level). The CH1 data was still correctly displayed (sine). Pressing Run yet again, usually leads to another working run. Continuing to press Run a few more times will eventually yield the above error case again, though.