Possible in-place upgrade issues
Vivio is getting internal reports that in-place upgrades of the Lucee version cause Lucee server to not start up properly. Based on these initial reports, I'm guessing there's a JAR conflict between the Installed Lucee version (the version that's distributed with the installer) and the Upgraded Lucee version (the version that's downloaded via the admin's upgrade feature).
I will need to test this and possibly restructure the Lucee installers to support this issue. It's also possible that this was something that the Lucee team did and only tested against Lucee Express, so I may need to communicate with them about this particular issue.
More research is required to verify that this is actually what's happening and why those in-place upgrades are failing.