Please try these steps. Note, if you try step 2, you may lose the configuration settings such as hotbar setups. So, back them up first. The folder is located in the My Game which is in Documents.

Steps:
1. Reset all internet explorer settings. Open up IE and click on gear (or however you get to the settings in your version), then click on the advance tab, click to reset all the settings and click OK for the pop up window.

2. If still problems, then log into the FF14 client. Do not click play though. Then click the settings and the option to reset all settings. (Note, I have not done this before, but others said they did. So, I may be wrong on where it is located.) Then try again.

If still issues, then it is something SE has to deal with and I am sorry about that.