After faithfully applying all the Thunderbolt/USB patches that have come out in the last few months, Windows 10 1903 won't show the memory sticks that I plug in.

For example, here's the output from USB Drive Info for one of these sticks:

     ========== Storage Volume on Disk 4 in Partition 1 ==========

MountPoint        = F:\

Volume Label      = STICK

Volume Status     = mounted

Volume Length     = 2 GB  /  1.9 GiB  /  2'013'264'896 Bytes

Volume Size       = 2 GB  /  1.9 GiB  /  2'009'067'520 Bytes

Volume Free       = 2 GB  /  1.8 GiB  /  1'972'273'152 Bytes / 98%

File System       = FAT32, 4 KB clusters, dirty=0

Volume Serial     = 7EE4-EABD

File System Flags = CASE_PRESERVED_NAMES, UNICODE_ON_DISK, 0x200, SUPPORTS_ENCRYPTION

Volume Name       = \\?\Volume{cdc880e5-556a-11ea-9cf6-a4c3f04b3cf4}\

KernelName        = \Device\HarddiskVolume17

Win32 Device Name = \\.\HarddiskVolume17

Writable          = yes

Partition Device  = \\.\Harddisk4Partition1

Partition Type    = FAT32 CHS (0x0B)

Partition Start   = 0x400

Partition Length  = 0x77FFFC00 (2 GB  /  1.9 GiB  /  2'013'264'896 Bytes)

Partition Align   = 1 K

1st Cluster Align = 1 K

Drive Type        = removable

Bus Type          = USB

Device Types      = RemovableMedia

DevicePath        = \\?\STORAGE#Volume#_??_USBSTOR#Disk&Ven_&Prod_&Rev_1100#B1304050000875&0#{53f56307-b6bf-11d0-94f2-00a0c91efb8b}#{53f5630d-b6bf-11d0-94f2-00a0c91efb8b}

DeviceID          = STORAGE\VOLUME\_??_USBSTOR#DISK&VEN_&PROD_&REV_1100#B1304050000875&0#{53F56307-B6BF-11D0-94F2-00A0C91EFB8B}

FS Write Cache    = no

Somewhere deep down in Windows, the stick is recognized and assigned a drive letter, but Windows Explorer won't show Drive F:. I can change to it by typing the drive letter and colon, and then I can navigate normally. However, there's no way to eject the media.

What can I do to restore normal Memory Stick operation?

Thanks in advance!
Hans