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The conflict was with a TinyMCEPluginNonVisual plugin. After removing it, the editor worked once again.
[TinyMCEPluginNonVisual(
AlwaysEnabled = true,
EditorInitConfigurationOptions = "{ extended_valid_elements: 'iframe[src|frameborder=0|alt|title|width|height|align|name]' }")]
public class ExtendedValidElements
{
}
I think you need an empty js file in the plugin folder for even server side plugins. Tinymce fails to overcome script not found issues on Firefox and Chrome.
I have the same issue with TinyMCE Visual Plugin, I added empty js file but it doesn't work .Any guide ?
CMS 7.1 patch breaks custom TinyMCE plugins; the TinyMCE editor will not be rendered if you have custom plugins. The plugin worked fine with CMS 6 and CMS 7.0, therefore the cause of breakdown is in 7.1 patch.