I've run into a fun little issue with ArcGIS Server 10.2.2 to end my week with... I have discovered today that the export operation (the one that renders map layer images) is randomly returning blank images. As in - I enter an export url into the browser, hit F5, get expected image. Hit F5 again - get blank image. Hit F5 again - get expected image. None of the parameters are changing - its exact same url. There is no observable pattern - sometimes I got to hit F5 multiple times before I get the expected image.
I remember facing a similar bug back at 10.1 - where every other GET query failed (How does that make it through testing???). This seems awfully similar to that. I starting search GeoNet - and have seen similar posts. Does anyone know if there is any official NIM for this issue - and more importantly a solution or workaround?