"Could not filter properly at browser launch. Reload the page to ensure proper filtering."

[troilus]

Prerequisites

• I verified that this is not a filter list issue. Report any issues with filter lists or broken website functionality in the uAssets issue tracker.
• This is NOT a YouTube, Facebook or Twitch report. These sites MUST be reported by clicking their respective links.
• This is not a support issue or a question. For support, questions, or help, visit /r/uBlockOrigin.
• I performed a cursory search of the issue tracker to avoid opening a duplicate issue.
• The issue is not present after disabling uBO in the browser.
• I checked the documentation to understand that the issue I am reporting is not normal behavior.

I tried to reproduce the issue when...

• uBO is the only extension.
• uBO uses default lists and settings.
• using a new, unmodified browser profile.

Description

1. ublock dispalys "Could not filter properly at browser launch. Reload the page to ensure proper filtering." on mutiple PC.
2. Dashboard page is pure white.

Edge version 129.0.2792.10 dev (64 )

Unable to resove after tried:

1. Using a new profile in private mode
2. Reinstall ublock in edge store(1.59.0) and chrome store(1.59.0).
3. Using uBlock0_1.59.1b8.chromium

A specific URL where the issue occurs.

Every website include about:blank

Steps to Reproduce

1. launch edge
2. Install ublock in Edge or Chrome store or import unzipd file

Expected behavior

ublock launch correctly

Actual behavior

ublock dispalys "Could not filter properly at browser launch. Reload the page to ensure proper filtering."

uBO version

1.59.0

Browser name and version

Edge 129.0.2792.10 dev (64 )

Operating System and version

Windows 10 19045.4780

[uBlock-user]

https://github.com/uBlockOrigin/uBlock-issues/wiki/Dashboard%3A-Filter-lists#suspend-network-activity-until-all-filter-lists-are-loaded

[shism2]

I am having the same problem.

[iam-py-test]

@shism2 this is not a bug; this indicates uBlock Origin is not yet fully loaded. uBlock Origin needs time to load it's filterlists, and Chromium browsers do not wait for it to be ready before loading websites. This can allow advertisements and trackers to be loaded before uBlock Origin is ready to block them. Thus, a warning is shown, and there is a setting to prevent websites from loading before it is ready.
Thanks

[baccccccc]

it looks like something has changed recently because this warning message is now persistent across all of my newly installed devices. (Somehow it does not impact previously installed devices.) It does not matter how long I wait (hours and days), UBO never finishes loading, and the warning message remains. Reloading the page does not help, and the settings page won't load either (so I cannot opt in to "Suspend network activity until all filter lists are loaded").

[pistolwhip-justin]

closed, yet still an issue. days, days waiting, days refreshing, nothing changes, same error.

[ErEbusE]

This is clearly a new problem, only in the same form as the old one

[gorhill]

It's a Chromium browser issue which has always been there, nothing new. The link provided above explain this.

[ErEbusE]

It's a Chromium browser issue which has always been there, nothing new. The link provided above explain this.这是一个 Chromium 浏览器长期存在的问题，没有什么新的。提供的链接对此进行了解释。

When it fails to load for hours or even longer, does it still exhibit this characteristic?

[gorhill]

Whoever want something to be looked in, the minimal first step is to provide troubleshooting information from Support pane in the dashboard, and provide the name of browser. If the warning never goes away, it's likely an unexpected error at browser launch.

---

It appears OP was using a non-stable version of Edge. The date of the report is August 30, while the dev version of Edge was 129 at that time. Edge being a fork of Chromium is even more likely to suffer issues in its beta channel, so the issue was likely a browser dev channel issue.