Bug- White Box With Cross Appears At Bottom Of Screen After Commenting On A Post

After commenting on a post, I'm getting this bug-there's a white box with a cross in it

It's not a browser cache issue, just cleared it, still appears.

Are you guys getting this?

-Test comment to see if it comes back-

Not sure; testing

Yup, it's come back

. Has it come back for you?

I saw it too; trying to see if I can get it to appear on a bug report.

Hmm, disappears too quickly.

You can use my screenshots if that helps

-Test Comment For Bug Report-

Testing... 

Personally, I've just formally bug reported this myself, but you folk can too

Yeah, I bug reported and just referred to this topic.

Other than the white X box on reply, it appears to be fixed.

Yeah

The white box means that for example you add a comment like me, and a white cross comes down and when you scroll there is actually a text saying

"Your Comment has been added', the older green box at the top was better

See this?

test

same

testing