David - thanks for responding. I can no longer reproduce this problem.
The following URL and code parameter data (without a version number) ....
http://developer.echonest.com/api/v4/song/identify?api_key=&code=eJzVmFuSZasNRKeEEOIxHBBo_kPw4txrV7siTEW4Phz-yTq9HyCkzJR2pyRu6QF7vSDkAVnyC-y8oNkLZnrBqi-I_gBN5wW5vKDEC8Z6QOH9B9T6APH2gu0veFcwtRe8K9jnC1xfcPILoj3ghwrqeMG7grM-oEx_gHh5wVNlP1RB9QXvKvwmz-9Mxn5A0XjA_2OufsW6J6_0tAcUPS8Y9oCffOM3ec4vePvGb_Kc9wt2fsHpD3gzttT5APH6gv8Zn88DfsPYIukFdb3gB8b-IpPvaeTN2KEv-M1E8Zs8P1lXWrzgneelL_ihCvsBWeQFbz6_q_Dmc9svmOMBBbE9QMoLfvCN_14LZa7_CHucYT3NWGtJ99USv5JYjnE0xtpzeQk_bWvTz12tfe69-xmpx5hnd2tjqGRnIR016s7VhvexB7_Cu8l0aOhKt2iFi_1Y1blEe2rZQ6N_Vj5pZFsjl5bK7kPCho4xx6rWElHoiM--EmFe-mYPokrdes5-II2dPXpNLkumDO1nx_4sOvJZc42SZ7bNi1Ztho_u3mSMwtPbQ9gmrz7mTKyUWmiqyewSVdKy43GUhbTUdqazFM-1ctqyrMfinLXUotU2ouWqfGG0ZitovjNJ8dwKq4W2DM3K4jvAXUm15rWVvdVOnLSvWa98in-BzbzHt2tfcGzqkTI4i061pXK29BQcs---kpWtkdu2WPXMqVmmOgWzSrgr1SVUQ7TFrfFi-6U71TlKr2RptSW5j7wXBY16rB-4vHRuX5ZqIYFVDySJSOqQSqSp7ppHRuNunlk9EuRqFjLCPfXmyvkLg_LAYua-R9xTPC9x7azBuDKtz0OF8i7l5K67NDut51rKGpGK6bCcpblwgN74tdl1p66eiw5nAKQKe2kvYjGzzh6Ec8-7GhQgA6udIotwIlZm4d2rrHEm70PxJub1cJwi0bo2KdQXhnPSneGxpMKh_gWfSL9d-4KpSKodOO4Ca7xKX7i2rQqnLfJEKhQACpzREUWSmhDJnJSY45OWIy06UrGxOjqczYeuQenuGzLrpCrT7WpNYlirx9uHa-xyH6Hk66bMC9pAXNRkL1hTWu8B3VV7DZgMSyWbUp5A3Iirkp-R0VRkX2UodK4B2e_ySLqNKdbhzuGfNc7qpdxkpht0zmWkpgPVrvgC_CKnb9f-uBskfUUhZGs-T2AxqDNVk3qIE0IUWJDnZDdo3IVxb0SOXNOcdfGNvDay6Mm4EwWhtZNh8vm8gZcNznc5jIwR8clRS9t5Ux_lbLfyY3fMwzcGNUZmjeqr4jc4x2x4m00rvreMpnBjhdiWMgcZIgLDrfbxmSwLJmN1JFzQbkP8BBkp0AH6zBAGlqsJdXWzjLlxPchXJYnFsdNPQH0RrRVW_kT1CchYRYlK46-A2GHHpIhfgJEV_3btD6BgnRSnjjXoXrOeURLlXmsb6sZOO75x4BOdEfVTkzqp8fj7bsYlPHeL-OMuLl1lbI5671YntI9Jb0c_beGsK-gGp6vARJo11MUHvVk5Y_EpknstxCLTDrY7pW8cAp710YMxKGpFHDFD4S4tQxyvM_bZThRbbuorCug0VbjhXjSZpkmxSYV4R94tcrGRHHKpJFYu6P2esq56ddWoFKLZmFwQpjjsgmNsR7lj2iDiq7Z_Aotu_3btC2gvnd4wy7RKdCVXepcJjZXCzTKqCMpOlg7jRVtYRHWvpB5n10OqcC5jPOy9jduAYPjpow071wRK2KxUsBQ585jfDXrG9j_WkWgbIcrfAQvNww7meF24JcWH-7WGjd4g_jpmcBrXL83Rf6X29Nb7B8_rlG_XuvLlxNy8vs01TqWroSA-i-hoWrfb6TlNLGnADBx0DnJPOXWPSu-40Z-O7qiAtLl46HyBlI6c_v3aH3ezxsZq3P1610J--BxGyVEOHtZGnVdhRRWHqhv9JwJoykZCy8-WMrmag7bM9Zw5Mk6ihWevM2SGG5nkq82YinM75OSkSoeiFDZpRZdBU8Ug8ix3KErpvrezkWbOnOEHQTBJ0H7aItjpg4IKDs8odu4EmhlVghlKT124vcxJ6Iic4YHKSzHWzUyitMc9dG880PH3WiuUSJKrpNpWzwtxpVmDzpMc9579sxvUOrqD8PPikJJCMEzmti8oCVP5du0LGOp8iypdehdkTTB4Eq2HWYdudlXDRMAMc7N5Vu1ycDOEpHh13aVnZW7c9KZLFMrBsF9a66UxCN6VSQXp48rGTLBpmDnmzqfe0y8-OXVdPd0u186dajYNf9PSUD9LM6FW5sJSt9AQ7qgBX3PHu_CdceeDRWytm3emA4e2lYZD7GnfTksTh_YUse1xSyjHS07BToxz90QlNyRzp9B7F601KpDYs94HVr68OgyfjYNRU9OgoIy5yphC35xKI2WcJiY6cmOCxLnp-xQZtxqbuYu-zEHv19cyDLFno5DOxv2OJKQdffeSN92WGZbR1JIzxPYviPufNt-ufcE_AKDG9u4=
... returns the empty songs array:
{
"response": {
"status": {
"version": "4.2",
"code": 0,
"message": "Success"
},
"songs": [ ]
}
}
When I add in '&version=4.11' or 4.12 (or 4.) , I get the correct identification:
{
"response": {
"status": {
"version": "4.2",
"code": 0,
"message": "Success"
},
"songs": [
{
"score": 31,
"title": "Accidents Will Happen",
"message": "OK (match type 8)",
"artist_id": "AROCZUC1187B9AD05B",
"artist_name": "Elvis Costello & The Attractions",
"id": "SOADJAU12A8C13C656"
}
]
}
}
I am not sure why this behaved as I noted previously, but the problem has gone away.