A couple of weeks ago I ran into an issue stopping me from importing an OVA and today I came across another issue relating to the Web Client not able to import OVF packages with compressed disks.
Deploying an OVF template containing compressed file references might fail
When you deploy an OVF template containing compressed files references (typically compressed using gzip), the operation fails.
The following is an example of an OVF element in the OVF descriptor:
<File ovf:size="458" ovf:href="valid_disk.vmdk.gz" ovf:compression="gzip" ovf:id="file1"></File>
The workaround is to download OVFTool and run a simple command to convert the OVF or OVA template to one without the compressed file…which in effect its just a copy of the original.