Ok, I gave it a try (downloaded twice), but it's almost worse than before:
Occasionally it also gave off API errors: "Oops! The API key or signature is invalid."
If I reset it to default that sometimes works. Still, there are issues where it refuses to insert anything into posts (despite all necessary parameters being check) and anything it does insert shows up blank after the published post (or in preview).
For good measure I tried changing the cache system from database to file system instead to see if that would help, but no dice.
More curious, when I open the manager window, only 4 images show up at a time. Very strange.
I've moved on to another solution though. Sorry this particular one didn't work out.