Omeka.net Exhibit Builder Not Saving Changes

Hi:

We Omeka.net customer. Our Exhibit Builder on a current exhibit has stopped saving (most) new caption changes. Luckily we were just testing capability so we started a new exhibit and it's working correctly. But wondering if this was a known problem: selecting "SAVE and Return to Section" does not actually keep changes (or it does maybe 1 out of 20 times).