Alert message box not working in server 4.3

[cochize1 40]

Seems that the alert message box stopped working in server 4.3. I need to communicate something to my users and followed all the steps from this thread:

https://emby.media/community/index.php?/topic/46788-notice-box-that-can-be-closed/

 

But there is no aler box showing (it worked just fine in server 4.2). Is there a solution?

 

EDIT: It works, just needed to clear cache (and don't know how to delete the post:) )

Edited December 8, 2019 by cochize1