If you have troubles since the update to WordPress 4.5 please read this post before opening a new thread.
How can I stop my alt text or image titles from poping up when mousing over thumbnails?
This is a browser (W3C) function, the best way to do it, is not have ALT text. I’m not sure if WP even allows this. It is there for accessibility reasons I believe. Sorry.
hmmm, problem is that I am using custom fields to pull in alt information in some posts. and well, in the php somewhere theres is a break tag i am using, when you roll over a thumbnail in safari and chrome when the alt shows up it has the code for the br tag as well. I can’t remove it because I am using that in light box where the alt shows up correctly.
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