Has VMWare Workstation become incompatible with VMWare Server?

I have a few VMs created in VMWare Workstation 6.5, which have been upgraded to version 7 compatibility. I can copy them to a PC running VMWare Server 2.0.2, and add them to the inventory of VMs with no problems. However, VMs created in VMWare Workstation 7.1.2 will make VMWare Server crash when I try to add them to the inventory.

According to the VM creation wizard, VMs created in Workstation 7.x should be compatible with Server 2.x, but something is very wrong here. Have the new Workstation versions become incompatible with Server? Would downgrading to Workstation 7.0.0 circumvent the problem?

The short and easy answer: Do not copy vmware virtual machines between different platforms. The support for this is limited. Use vmware converter instead. It will ensure the virtual machine is compatible with the vmware product you want to use.