My company is having the same problem! The Estimates function and the ability to approve or decline them from within the document is critically important to our daily business! I am extremely disappointed in QBO after being a long-term desktop version user. I see no point in contacting Support after reading the experience(s) here. The constant glitches in the Estimates and Invoicing features of QBO is embarrassing! It gives an unprofessional look to my business and I no longer have confidence in the experience my clients will receive on their end. I didn't even know that this was happening until I received multiple emails and complaints from clients. I am considering other accounting software if this continues much longer. This is ridiculous, frustrating and borderline infuriating! Just wanted to add my experience to the conversation.