Summary to solve re-occurring Epic Privacy Browser launch issues

Recurring Problem:
Epic Privacy Browser will suddenly, inexplicably, simply fail to launch (wouldn't start from existing shortcut, not running in Task Manager/Process Explorer, no error messages and a reboot doesn't help but a re-install always fixes the recurring problem which happens sporadically, about once every few months).

Successful Solution (20250615):
I deleted the %localappdata%\Epic Privacy Browser\User Data\Default folder. Result: Epic launched successfully from the shortcut that previously stopped working.

This happens about once every few months.
I don't know why.

The assumption is "something" got corrupted.
But what?

Lessons Learned / Recommended Targeted Approach for Next Time:

Before deleting anything, ALWAYS BACK UP:
a. %localappdata%\Epic Privacy Browser\User Data\Default\Bookmarks (Your saved bookmarks)
b. %localappdata%\Epic Privacy Browser\User Data\Default\Login Data (Saved passwords)
c. %localappdata%\Epic Privacy Browser\User Data\Default\Preferences (Core browser settings)
Note: These are files within the Default folder, copy them before deleting Default or specific sub-elements.
Copy them back later after restarting & immediately killing Epic, which re-creates the Default folder.

Once you've copied those files, then you can attempt a targeted deletion of suspected corrupted elements (one by one, testing launch after each deletion), attempting to restart Epic after each targeted deletion.

Most likely culprits (in order of likelihood):
1. Delete the file containing Epic's core configuration. Then test.
%localappdata%\Epic Privacy Browser\User Data\Default\Local State

2. Delete the folder containing session data for open tabs/windows. Then test.
%localappdata%\Epic Privacy Browser\User Data\Default\Session Storage

3. Delete the session data folder, often alongside Session Storage. Then test.
%localappdata%\Epic Privacy Browser\User Data\Default\Sessions

If those don't work, then try these far-less-likely possibilities:
A. Delete the folder for web content cache. Then test.
%localappdata%\Epic Privacy Browser\User Data\Default\Cache

B. Delete the folder for compiled JavaScript. Then test.
%localappdata%\Epic Privacy Browser\User Data\Default\Code Cache

C. Delete the folder for extension data. Then test.
Note: This will likely require re-enabling/re-logging into extensions.
%localappdata%\Epic Privacy Browser\User Data\Default\Extensions

D. Delete the folder for offline web app data. Then test.
%localappdata%\Epic Privacy Browser\User Data\Default\IndexedDB

If targeted deletions fail, delete the entire Default folder.
Then restore backed-up data. This always works.

If you know of a better solution, please let the team know as we're all more powerful together than we are all alone.

--- MBSE BBS v1.1.1 (Linux-x86_64)
* Origin: BWH Usenet Archive (https://usenet.blueworldho (3:633/280.2@fidonet)