I've recently upgraded to 4.7.7 and it seems this has caused me to be unable to administer cividiscount. Current discounts are working, the extension is listed properly, there are/were no errors at any point. It's just when you go to the cividiscount URL you get the main civiCRM dashboard!
Previous version was 4.7.4, cividiscount version in 3.2 running on Drupal 7.43
I have noted a similar question here same sounding problem on a different version, no solutions.
How do I even start finding out what this is? do I need to turn on some sort of debugging and look at lots of logs?