Can't work with stacks at all in 5.6.3.4 - "page not found"

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I have a C5 install in which stacks won't work at all:

- Pasting blocks from the clipboard results in the spinner rotating indefinitely
- Creating new blocks gets the following message when saving: "Page not found This page could not be found."

When doing the former (pasting from clipboard), I get a 404 in the browser's error console for the URL

http://<domain name>/index.php?pcID[]=33&add=1&processBlock=1&cID=447&arHandle=Main&btask=alias_existing_block&&ccm_token=1463417397:172843bd325afff57470d6a0780e0bd4


http://<domain name>/index.php exists, though, and is the default C5 gateway. So it's C5 throwing the 404 error when given those parameters!

What is going on?

- I am logged in as admin
- Tried logging in and out
- Tried updating (no updates available right now)

pekka
 
pekka replied on at Permalink Reply
pekka
I might be able to debug this myself if anyone could give me some pointers - does C5 have an internal log where I might be able to see why a 404 is thrown?