This appears to be correct. I had explicitly specified a selector of #brxe-a0e1e6 in 1.8 but it appears that even in 1.8 that selector never existed (I likely received a new auto-generated selector when replacing some elements in the design process) even though it still worked fine in 1.8. If I set the CSS Selector in the Mega Menu section of the Dropdown element to a selector that exists currently, it then shows as expected again in 1.9.
Thank you for your assistance on this. I’m curious though… was there a changelog entry for this? Was it the one in 1.9 titled “Nav nestable: Nested mega menu wrong position”? If yes, this is another example of a changelog entry that doesn’t really yield much information or details as to what was changed or what users should expect when upgrading, and these extra details would be helpful in the changelog entries. There was no link for it or anything with extra details, assuming that’s even the right one. Please consider this in the future for the changelog entries.