I've changed my password twice today. After changing, I can login successfully to x10 forums with the new password. But, even after the cPanel password change is complete it still doesn't work...?
Then, click View Details in the yellow box
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Free Hosting active username XXXXXX » View Details
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Now, you should see a
'Hosting Account Management' page.
Click Login to cPanel. (Automatic Login/No need to enter username and password)