I have similar issues.
Problems Recording.
-- Recording does not play when Play Recorded Slideshow; only the last slide played is shown. I can go back to the first slides, but they do not advance as in the presentation, and there are no builds. There is an embedded QuickTime movie in the presentation-- this does not play within the recorded file.
-- Can not export Recording to movie; I thought these animations and builds would not play in the preview mode, so I get a similar error message when I attempt to export. See attached screenshot.
Problems with Recording mode interface:
--Differing time remaining clock between Rehearse Slideshow and Record Slideshow; the Rehearse Slideshow can be set to the time remaining clock-- which is vital since I am trying to coordinate the slide with the video. I can not have the time remaining clock set (or even the time-lapsed clock) set or work automatically in the recording mode. This makes coordination slide/video near impossible.
Everything works fine as a regular 'from Keynote" presentation.
This is a long presentation (126 minutes). I do not know if that is the issue. I have made short test recordings as well in case the size of the file was the issue.
This presentation was first presented at the end of last year-- I have been editing it and prepping it for distribution for more than a month now. It is part of a paid presentation vital to the Not-For-Profit organization for which I am the director. I need to turn this around promptly.
I have been a Mac user since 1986. I have used Keynote since its inception. Be well and be safe, and thank you for your assistance.
John