hello im having the same issue...kind of...let me explain
a week ago (11/25/2018 Sunday) I first used that USB installation method and worked perfectly.
Yesterday (12/02/2018 Sunday) began to show flaws, what seems is related to the placeholder (placehld)
at the end of the installation since yesterday,started to give 3 diferents errors,The first its failed to create flaceholdr error code 0x00004e02.
The Second one its a "Error has ocurred" screen.
And the last one,its looks like the game installed perfectly,but when i boot the game, on the first load the game froze,forcing me to hold power up for 12 seconds.
so..anyone knows why this is hapening? it was working perfectly for 1 week
My Switch is a European on Firmware 5.1.0 Using ReinX,and the Tinfoil Version is 0.2.1
My pc is Runnin a Windows 7 -64 bits and i installed the drivers using zadig 2.4
Luckily the old classic method using sd cards still works
Oh and the sd card was emtpy with only the necessary to run tinfoil and homebrew,no games at all, and its a microsd 32gb kingston class 10
thx in advance