Restoring From Compressed VHD Image Issue

I have an installation that is now using compressed VHD for image backups. I just so happened to need to restore a Windows client from this installation, but could not get much accomplished and ended up restoring everything manually.

I could get as far as picking the image to restore from the list of clients, but after waiting 1/2 hour, the client indicated 1% complete while the webgui still indicated 0%. Then the client restore window closed as it dropped back to text terminal and that was it.

Now, I am not sure if this was a one-off failure or if all my compressed VHD images are not good. I will try a no pressure test in the near future, but thought I would ask if this is a know issue or different procedure needed? I have previous tested restores using raw imaged which worked fine.