302 Redirect

Hi,

I run a little WordPress blog here:
http://gigi.nullneuron.net/gigilabs/

I published an article and tried sharing it on Facebook, LinkedIn and Google Plus, and noticed that none of the social media managed to get an image preview. Upon further inspection I used the Facebook debugger:
https://developers.facebook.com/tools/debug/og/object/

and noticed that it was doing a 302 direct. So from here:
http://gigi.nullneuron.net/gigilabs/analyzing-live-process-memory-with-clrmd/
…it goes here:
http://gigi.nullneuron.net/VTUNZ/gigilabs/analyzing-live-process-memory-with-clrmd/
(the five extra characters seem to change each time)

If I follow the second link, I get:
[an error occurred while processing this directive]
…which I suppose is causing the errors that prevent images from appearing on the social media.

Any idea why this is happening? Upon searching I found some posts related to 302 redirect, but they were due to some bug in WordPress 2.0.5 (I’m running the latest, 4.2.2).