Quite the bump... but one of my Unraid servers had my Plex that my wife used... it's old equipment, so figured leave it well enough alone / ain't broke / etc. Finally decided to bite the bullet, crossed my fingers, and upgraded it to 6.12.10 a little while back. Didn't notice one of the Shares with TV shows was "not viewable" from Internet Explorer until tonight when I went to grab something out of it.
Quick google, found this thread, sighed relief... and found 'New Permissions' in the tools.
Ran it on the missing share. No love, no fix, no help.
Thought I'd "change" the share, to see if I could get it to re-write it (kind of like recreating a container in portainer, to manually update/re-pull an image), anyway, here's what I did (and it worked) just for the record in case there's another late updater that has a similar issue that 'New Permissions' doesn't help on.
Opened the share, went to SMB Security Settings, left the export & names the same (i.e. yes it's exported), but changed the security from 'Public' to 'Secure' then added myself as read/write under the newly added SMB User Access. Hit Apply to update settings, and voila, visible again in Internet Explorer.
Probably not the most proper of fixes, but quick and dirty worked, and it appears to have reset permissions to make it SMB reachable. Hopefully the next person to google in a panic cause a directory is gone can find it helpful.
And even tho it didn't work... a most SINCERE Thank You to the awesome folks who offer advice on here, it is GREATLY appreciated time and again in helping trouble shoot my much loved Unraid box. 😀