Probably server security software such as mod_security. Your host can help with this, there will an over-aggressive rule triggering it.
That said, the vB4 WYSIWYG editor isn't designed for complicated html pastes, and you will often find this will go wrong. It's designed for basic WYSIWYG formatting.
Forbidden problem
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Forbidden problem
I have a problem when writing a new topic in a way copy from other sites
Where when using the editor for a sophisticated WYSIWYG mode
And I'm posting this thread showing me a page with a line
Forbidden
You do not have permission to access/vb/newthread.php on this server
This problem sometimes appears and sometimes disappears
And when you do not use the Advanced editor it does not appear wrongTags: None
widgetinstance 262 (Related Topics) skipped due to lack of content & hide_module_if_empty option.
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