I too have the same problem since updating to WP3.9 and TinyMCE Advanced 4.0.1
The ‘Styles’ button is missing.
I also have the following warning on my Plugins page:
The Advanced TinyMCE Config plugin requires attention: you are running TinyMCE 4.0 (WordPress 3.9 or newer) but the settings for the editor have not been updated. This can result in errors while editing, or the editor may fail completely.
I am running a multi-site install of WP.
I think this is resolved. Took me a bit but I found the styles.
Check off the box in the advanced section that starts with “load the css classes”, add the “formats” dropdown to your button bar and save. You will find the class styles in the dropdown.
Debra
The other message is from the Advanced TinyMCE Configuration plugin. If you used it to add some settings to TinyMCE 3.x, it’s good to review them now as TinyMCE 4.0 is quite different.
Check off the box in the advanced section that starts with “load the css classes”, add the “formats” dropdown to your button bar and save. You will find the class styles in the dropdown.
Very strange – I don’t have the ‘advanced options’ section????
Maybe something to do with the fact I’m running the plugin in a multi-site environment…