Hi @Riffman64 and @lana_5543,
I completely understand how frustrating this is, and I really appreciate you taking the time to call out what you're seeing. For the text disappearing while editing, we do have a bug already logged and the team is actively working on a fix. You can track the discussion and updates here: https://adobe.ly/45ARWgL.
For the Undo behavior where the history seems to clear itself unexpectedly, this is also a known critical issue that's currently under active investigation by the team. More details and updates are being tracked in this thread: https://adobe.ly/4qb93hr.
Regarding the message that files "were created with a newer version of InDesign", could you please review this post and let me know if your situation matches what's described there: https://adobe.ly/4svdDsv. If it doesn't seem similar, then as recommended by the expert, please confirm whether you currently have multiple InDesign versions installed at the same time and whether the file might be created in a newer version and then opened in an older one. It would also help if you could share the exact InDesign version you're on and your OS details.
Thanks again for raising these concerns. Please let me know your observations and any updates to take this further.
Abhishek