Same issue meaning after I consolidated the disks and ran a backup the "needs consolidation" came back. VMware tech support instructed me to do this below which worked on a few other machines but is this necessary?
Power off the vm and edit settings select each disk and copy the path showing in the right hand pane into note pad
The instructions for deleting the ctk files and the vmsd are as follows.
cd vmfs/volumes/datastorename/vmname <<<<<< go to the vmfolder.
ls -lah <<<<<<<<<< list all the files in that folder in human readable form.
mkdir _deleteMe <<<<<<<<<<<< makes a folder called _deleteMe this is where we will move the files.
mv *-ctk* _deleteMe <<<<< this moves all ctk files in this folder to the _deleteMe folder.
mv *.vmsn _deleteMe <<<<< this moves all vmsn files in this folder to the _deleteMe folder.
mv *.vmsd _deleteMe <<<<< this moves all vmsd files in this folder to the _deleteMe folder.
cd ../.. <<<<<<<<<<< takes you out of the vm folder.
now power up vm
This will create new vmsn and ctk and vmsd files then do the back up again. The first back up will be a full backup and after that you can do incremental back ups.