You will see my reply in that thread which explains the problem:
Before making today's discovery that Everything is locking the drive, I've been gaining access to the drive daily by locking it after unlocking, and then unlocking it a second time. This ALWAYS works, but is a timewaster.Thanks so much for posting this Bert - you solved the exact same problem on my laptop today! It's been driving me crazy for a long time. I unlock the internal bitlocked partition and the padlock icon changes colour and turns into an 'unlocked' padlock, but there is no drive info (used/free space) and double-clicking the drive produces 'Inaccessible' error.
This morning with the drive in it's unlocked but inaccessible state I stopped the Everything (from voidtools) Windows Service and then refreshed the File Explorer screen (F5). Immediately the used/free space appeared and I can access the drive. Starting the Everything service once the drive was fully unlocked has no effect on the drive. I have used "Everything" for many years as it's the fastest most reliable and customisable file search tool out there (I love this search tool to the moon and back!). This won't stop me using it because it's just so useful, but I may have to create a batch file to stop the service, unlock the drive and then start the service. Before that though I'll contact voidtools and see if they can fix the bug.
Are there any settings that can be changed in Options to solve this problem or can the bug be fixed? I am running Windows 10 Pro 1809 OS Build 17763.475