When signed in does the issue still occur if you go to https://my.virginmedia.com/my-apps/onlinesecurity/websafe/settings?
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Thanks for your post on our Community Forums @Unicornlala, and welcome back!
Sorry to hear of the issues with altering web safe on your connection.
Can you please confirm if this is still happening, and if so, have you attempted to clear cache on the browser, or used an alternative browser?
If you're still unable to use this feature, we'll be alter this for you, via private message, provided you are the account holder.