Greetings,
I've been having the same problem with list items in Chrome since v24, and it's been driving me nuts.
Based on some of the info in @rx2's supplied links, I tried an experiment. The following is what amounts to a work-around, and would very likely be overwritten in a MODX version upgrade, but may also help diagnostics toward a permanent fix.
I'm seeing it in MODX 2.2.7, TinyMCE 4.3.3.
- In Manager, go to System Settings & filter for TinyMCE settings
- Lookup the Editor Theme and TinyMCE Skin settings
- Find the related TinyMCE theme CSS file named content.css. It should be assets/components/tinymce/jscripts/tiny_mce/themes/[your_editor_theme_setting]/skins/[your_tinymce_skin_setting]/
- Save a copy of the file
- Tinker with the settings of the body element. In my case, (using the advanced theme/circuit skin), I solved the above by changing the font size definition to remove the line-height, i.e. 12px/1.5em becomes 12px
Worked for me. No promises; your mileage may vary.
Bug report
http://tracker.modx.com/issues/9491 may be related; this 'fix' seems to solve that particular problem for me too.