Cannot clear WF cache

Yes, you can delete everything manually in the wfcache folder using FTP. Try that, then disable cache, and reenable cache. See if that helps.

-Brian

Same problem – I cant delete the files in FTP or using cPanel file manager so I think it is a server issue.

Will contact the host.

It was an ‘ownership issue’ for that folder.

A few similar problems like this have cropped up since the core update to 4.4

Thanks for following up — it sounds like this might be related to the issue in WP core, described here:
https://core.trac.www.ads-software.com/ticket/34976

-Matt R