Designer won't start

I had several Designers open when I left last night, and overnight my machine installed updates and rebooted. When I tried to open a Designer, it got stuck loading Perspective:

I killed the process, closed the Launcher, went to the gateway page and downloaded the Designer installer, and ran it. Now, the Launcher itself is stuck on this screen:

Any ideas what to try next? I tried uninstalling from Windows, and got this:

I started looking for where those files might be, when suddenly the Launcher finally opened. But when I try opening a project, it’s right back to being stuck on loading Perspective…

You could try deleting the ~/.ignition/cache directory.

Where is that on Windows?

~ is your user home directory, so wherever that is.

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If that doesn't work, look at ~/.ignition/clientlauncher-data/designerlauncher.log.

Somewhere in this file there will be a long command string on a line that starts with something like "Starting Java with the following parameters..."

You'll want to copy this long command and run it in a terminal and then share all the output.

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That worked, thanks! It wouldn’t let me delete the folder until after I rebooted my machine, because something had a lock on it (though I couldn’t see any Java processes in the Task Manager).