Good thing you sent the png file because those are called "autos" (which I guess are a type of keyframe).  Here are the pertinent shortcuts.

Next auto --  Alt-a       Move to next auto.
Previous auto  -- Ctrl-Alt-a      Move to previous auto.
Next auto select   -- Alt-Shift-A      Select from cursor to next auto.
Previous auto select --  Ctrl-Alt-Shift-A      Select from cursor to previous auto.

Settings pulldown on the main timeline window, Preferences, About tab, the second line from the bottom on the left side displays the build date.

BTW - the website now has had the download links mostly fixed now too.

Next & Previous keyframe (k, ctrl-k) do not work for me, only seem to go to the start (extreme left) or end (extreme right) of a clip, see pic attached. Select modifier (shift +) does select, but does the same only moving cursor end to end.

I insert keyframes by --> Keyframes --> insert keyframe   then zoom in to select with cursor right-click to adjust. 

So I'll try a more recent executable.

May I suggest including a date or version in future executables? Perhaps in an About under Files. If there is currently a way of referencing the version, build or date then I don't know where to find it. The executable I am currently using on Ubuntu 24.04 is; File: Cinelerra Size: 167527616  (Date?:) Birth: 2025-06-07.

Thank you to all.  

The download area has changed and is now at (yes, still working on updating the front page of the website)

     https://download.cinelerra-gg.org/

look for the PDF file, CinelerraGG_Manual.pdf 

Next keyframe ---- k

Previous keyframe --------- control k

Next keyframe select ------  shift k

previous keyframe select ----- control shift k

When I go to check the manual at cinelerra-gg.org/downloads/#documentation it seems

the PDF of the user manual is not valid. Perhaps the new site is settling in.