ah. Looks to be my mistake. Did not realize I had to uninstall the free version first.
Disabled free version and now it's happy.
Anyone else having this issue? Ever since the latest update, I've been unable to save menus without getting a 504 error; I have to deactivate the plugin if I want to modify. As info, we use the Extra theme by Divi.
Please tell me which theme version are you using?
@epsilonadmin Version 4.9.7.
Hmm, I just installed Extra Theme 4.9.7 on my machine and it works well with WPFTS Pro's latest version.
Could you please check the error.log on your server and find something related to this error there? Or send to me please last lines, maybe I can find the reason for the issue.
Also please try to switch ON debug mode in your wp-config.php, it may show you some message before 504 error.