Designer launcher failed to launch

[pturmel]

Read this entire topic, particularly near the end where LENIENT mode is discussed:

Unable to start Designer or Client ERROR "This Launch Jar Signature is invalid. Contact an administrator"

Hello I have been using ignition for awhile. I recently uploaded my files to an IPC in my control panel. It was working great for a few days until about an hour ago. I have been getting the error every time I try to launch a project in both the designer and client . "This Launch Jar Signature is invalid. Contact an administrator". I have cycled powered, reinstalled ignition designer and client and deleted all my files inside the .ignition folder under users. I am stumped on what to try next. Tha…

FWIW, this simple search led to the above discussion:

https://forum.inductiveautomation.com/search?q=designer%20signature%20invalid%20order%3Alatest