So I've tried it on Chrome and Firefox and haven't seen that. What browser are you using?
Thanks. So from what I'm seeing, it looks like if you select the (long) save string, it shoots the game window out of the view of the browser. If you scroll all the way down (but don't use the mouse wheel) and then select the text, it will stay on screen.
I have a fix, but I think I'll hold off until I have a better solution for how to do the WebGL updates. As you guys have found, the text is still being selected and is copy-able; it just disappears. For me, the disappearance was until I clicked again and deselected the text.
Oh sorry. To be explicit, if you select the text and it disappears, it is still selected, just not visible. So you can still copy the text with Ctrl - C (even though it isn't visible) and paste into Notepad or whatever else with Ctrl - V.
When you want to import the string, paste it in and hit the Checkmark Button to import. If you click the string, the UI may disappear if it gets selected, but click it again to deselect the text and it should come back.