Sony has confirmed to Eurogamer that problems with one of the downloadable PSone games released on PlayStation Network last Thursday have led to its withdrawal.
MediEvil has a confirmed crash-bug that causes it to fail on the third level. Sony said it would return to PSN once fixed and that anybody who had paid for it would be able to re-download it for free then.
Sony is also investigating reports of audio problems in Spyro 2, which remains available on the store, although there are anecdotal reports of broader issues with that one, so you might want to duck it for now too.
The two games were released for GBP 3.49 last Thursday along with Crash Bandicoot 2 at the same price, which seems to be working alright. Touch wood.
Sony wasn't able to offer an estimate on when MediEvil will return to the store, but said it would have something to say on that front in due course.
For more on what's going on, keep an eye on the official Sony forum thread relating to the problems.