The history panel does not allow some actions to be undone. One is the act of stepping back several steps. As long as no new actions are done, you can step forward again, but as soon as you complete a new action, the inbetween steps disappear. The undo/redo history is also cleared; only new actions completed after that point can be undone. This is a problem because is makes it impossible to test various options and then quickly return to the original option, as I have often done in the past. Instead, the desired option must be set up again from scratch. (tested in v. 20.1, but also caused issues in older versions)

• Actions logged appear to update/condense/disappear when switching to and from the Type tool. For example, if I create a text frame, enter some text, and then apply a stroke, the “Create text frame” option is no longer visible in the history panel, nor can it be undone with undo. If I create a 2nd text frame, all the previous steps for the first text frame disappear. Because “open” remains as the first action, it appears as if no other new actions were completed, but this is entirely false. Losing the ability to undo one’s actions is a serious hindrance. Undo history should not be cleared until the document is closed. I have also noticed there is sometimes a significant lag when switching to and from the text tool, and I suspect it has something to do with this. (tested in v. 20.1, did not notice before)

• Many actions logged are too vague to identify, especially when multiple instances of the same action occur. It would be ideal if, instead of “Typing,” one would see “Typing 123…” Link updates could include a right click option to jump to the affected link. Alternately, selecting a step could select the affected text or object, or a page number could be made visible in the panel. It would also be helpful to save a thumbnail at certain points. (in all versions I have used, current version is 20.1)