Hi there,
yesterday i encountered a strange bug. After receiving the Quest to obtain Shadowmere from the Dark Brotherhood, i went to the bubbling black pool, the sound played but the damn horse didn't spawn. I tried it with differernt savegames and even a new installation but nothing helped.. only way was to "cheat" shadowmere to me via console. Anyone knows any fix or a reason for this bug?
and sry for spelling issues.. english is not my native tongue.
"■On occasion, when you are standing in front of the pool from which Shadowmere is supposed to spawn during The Cure For Madness, you will hear Shadowmere rising out of the pool and then neighing, but he will not actually rise from the pool, effectively making him impossible to ride or otherwise be unable to ride as he will be trapped. However, Shadowmere wasn't actually prevented from spawning; the scripted event that makes him rise from the ground never occurred. So a good fix for this would be to wait until the quest Death Incarnate when there are enemies near the pool and bring one of them close to Shadowmere. With luck, the enemy you are fighting will lure Shadowmere out of the area he is trapped in and you will be able to climb on his back and then ride him whenever you wish."
http://elderscrolls.wikia.com/wiki/Shadowmere