We are still on Drupal 6 which has worked fine for years, and I have not done any updates. We have Date/Time boxes on our "Events" items with pop-up boxes (see image). But since recently the when you 'Edit' an event the dates/times go blank, but they didn't use to. We've done nothing to alter the setup at all!
It is not only annoying, but as the 'Front Page' is set to Chronological order, if the date is blank the event disappears (past it's date presumably), so the author can't even see it to notice & correct it!
There is another question similar "when using Scheduler......" The only answer was "it must be a bug - report it" BUT it used to work fine, and we have not changed or updated anything (I don't know how to!) Apart from this the site works fine!
I am not a Drupal programmer so don't ask me to update any code! I presume it must be a 'setting' somewhere, or could it be to do with lack of memory????
one image is date/time boxes as they appear on editing, the other image is how they look when the event is first posted (or when dates re-entered)