Received Error: "Cannot load the DLL xpQuestLogReader.dll, or one of the DLLs it references. Reason: 126 (The specified module could not be found." after cluster failover to passive node.
LogReader components is not supported for clustered servers.
Fixed in a future version of Log Reader.
Install Server Components manually to the active node of the cluster. Then copy the components (xp_QuestLogReader.dll) to all the SQL Server binn directory of the passive node instances.