The Quick Base Community will be read-only from August 19th-23rd while we finalize the updates to launch our new community site. On August 23rd the new community site will be live and accessible right here at this same URL with the full launch on August 27th with a special AMA with Jay Jamison on our exciting Cloudpipes news.
If you run into an issue while we are working on our migration you can reach out to our Care team via a Care case for help. There is a link to submit a case right on the Community home page or at our Contact Us page at www.quickbase.com. Thank you for your patience while we work behind the scenes.
It sounds like you are making use of a Multi-Line text field that is making use of Log Editing. I would suggest going into your field settings for that field and checking to see if the option 'Log the edits to this field, and show them on forms'. If that is enabled it doesn't allow for older entries to be edited as they are now logged. That option would need to be disabled long enough for you to edit it and then re-enabled. Do be aware that while disabled any edits others make to that field will not be logged in the same way until it is re-enabled.