I encountered an issue today while uploading an image related to my answer to this question. $\pi$ from the unit circle, $\sqrt 2$ from the unit square but what about $e$?
When I clicked on the icon to add an image and uploaded the image from my computer, a new tab with the link "https://math.stackexchange.com/upload/image" opens but the image does not get uploaded. The small window on the initial screen says "Uploading..." but it never gets uploaded. (In the end, I gave up and added the image to my dropbox public folder and added the link to the answer.)
I wanted to upload a screenshot of what is happening but again I am unable to do so on meta as well.