Hello
I have the same problem: Wanted to export a list with 120 vms, and excel only showed me only 112. I restarted the vc service, waited long time (displaying the vm list) before exporting... it didn't work.
I checked every vm in the inventory and looked at my export list, so I could identify the missing machines. I can see no similarities when looking at the concerned machines. I can see no reason why exactly those 8 machines are not exported.
What I did is: Rename the vms, rename it back to the original names. Then I tried the export again and - it worked!
Probably a bug in VC?
best regards
Roland