Hi, I have this image in uploaded to glance

root@controller:~# glance image-show 2efd517e-8445-451a-a5e6-6fc1915a87cd
+-------------------------------+--------------------------------------+
| Property                      | Value                                |
+-------------------------------+--------------------------------------+
| Property 'vmware_adaptertype' | ide                                  |
| Property 'vmware_disktype'    | sparse                               |
| Property 'vmware_ostype'      | ubuntu64Guest                        |
| checksum                      | b2e19636acac0b2944e52bd50d09618f     |
| container_format              | bare                                 |
| created_at                    | 2014-01-15T20:49:52                  |
| deleted                       | False                                |
| disk_format                   | vmdk                                 |
| id                            | 2efd517e-8445-451a-a5e6-6fc1915a87cd |
| is_public                     | True                                 |
| min_disk                      | 0                                    |
| min_ram                       | 0                                    |
| name                          | Ubuntu 12.10 x64                     |
| protected                     | False                                |
| size                          | 834011136                            |
| status                        | active                               |
| updated_at                    | 2014-01-16T19:25:38                  |
+-------------------------------+--------------------------------------+
root@controller:~#

I can successfully spawn instances from this image. Taking a snapshot of such an instance using Horizon, I get a new image:

root@controller:~# nova image-show 0ae15122-3c5d-4caf-a380-47b2cb033937
+-------------------------------------+--------------------------------------+
| Property                            | Value                                |
+-------------------------------------+--------------------------------------+
| metadata vmware_ostype              | ubuntu64Guest                        |
| metadata owner_id                   | 2575481bef7f4fde956202e3070fe688     |
| minDisk                             | 10                                   |
| metadata instance_type_name         | m1.tiny                              |
| metadata vmware_adaptertype         | ide                                  |
| metadata instance_type_id           | 7                                    |
| metadata instance_type_memory_mb    | 512                                  |
| id                                  | 0ae15122-3c5d-4caf-a380-47b2cb033937 |
| metadata instance_type_rxtx_factor  | 1                                    |
| metadata vmware_disktype            | sparse                               |
| progress                            | 100                                  |
| minRam                              | 0                                    |
| status                              | ACTIVE                               |
| updated                             | 2014-01-19T11:21:04Z                 |
| metadata instance_type_swap         | 0                                    |
| metadata instance_type_vcpus        | 1                                    |
| metadata vmware_image_version       | 1                                    |
| metadata base_image_ref             | 2efd517e-8445-451a-a5e6-6fc1915a87cd |
| metadata instance_type_flavorid     | 1                                    |
| OS-EXT-IMG-SIZE:size                | 10737418240                          |
| metadata image_type                 | snapshot                             |
| metadata user_id                    | a8b5af7cb2ab401f90d5b4903c091216     |
| name                                | x2goserver                           |
| created                             | 2014-01-19T10:47:19Z                 |
| metadata instance_uuid              | 23157768-3bd7-45ad-af3c-9af0c343ef54 |
| server                              | 23157768-3bd7-45ad-af3c-9af0c343ef54 |
| metadata instance_type_root_gb      | 10                                   |
| metadata instance_type_ephemeral_gb | 0                                    |
+-------------------------------------+--------------------------------------+
root@controller:~#

When I now boot a new instance from this snapshot, I get the following error on the compute node:

2014-01-19 20:20:39.885 1979 WARNING nova.virt.vmwareapi.driver [-] Task [CopyVirtualDisk_Task] (returnval){
   value = "haTask--vim.VirtualDiskManager.copyVirtualDisk-415701974"
   _type = "Task"
 } status: error The virtual disk is either corrupted or not a supported format.
2014-01-19 20:20:39.887 1979 ERROR nova.compute.manager [req-d1c54c3e-c47c-4596-8f2a-c7f732bd5075 a8b5af7cb2ab401f90d5b4903c091216 2575481bef7f4fde956202e3070fe688] [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4] Instance failed to spawn
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4] Traceback (most recent call last):
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4]   File "/usr/lib/python2.7/dist-packages/nova/compute/manager.py", line 1407, in _spawn
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4]     block_device_info)
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4]   File "/usr/lib/python2.7/dist-packages/nova/virt/vmwareapi/driver.py", line 186, in spawn
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4]     admin_password, network_info, block_device_info)
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4]   File "/usr/lib/python2.7/dist-packages/nova/virt/vmwareapi/vmops.py", line 449, in spawn
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4]     uploaded_vmdk_path)
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4]   File "/usr/lib/python2.7/dist-packages/nova/virt/vmwareapi/vmops.py", line 387, in _copy_virtual_disk
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4]     self._session._wait_for_task(instance['uuid'], vmdk_copy_task)
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4]   File "/usr/lib/python2.7/dist-packages/nova/virt/vmwareapi/driver.py", line 900, in _wait_for_task
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4]     ret_val = done.wait()
2014-01-19 20:20:39.887 1979 TRACE nova.compute.manager [instance: 8cc38d9b-e018-4cfa-aa02-eb1b9daa3cd4]   File "/usr/lib/python2.7/dist-packages/eventlet/event.py", line 116, in wait
2014-01-19 20:20:39.887 1979 ...