Re the 90 day online reporting issues. I always found that using IE11 is preferable to the other search engines, but also utilise the drop-down menus wherever they are available.
TLDR : Answer Summary
Users have found Internet Explorer 11 effective for the 90-day online reporting system, although it's noted that it has been replaced by Edge in Windows 10. Comments suggest ensuring compatibility by using various browsers like Firefox, Safari, and Chrome while following troubleshooting steps such as turning off pop-up blockers and VPNs. If online submission fails despite these efforts, filing in person may be necessary.