On CHS options, capture options, there is the section (upper right) labeled "Text Capture Limits". For me, the 3 checkboxes are disabled. The input boxes are live, though I can't put a number > 9999 in for plain text, but I can put in anything for Richtext. I was copying a plain text web page and CHS doesn't put the text into quick-paste menu. If I select half the page and copy, it does. So seems to be a limit issue.
CHS 2.19.01 portable mode