Gee @mikewalsh I am not sure what you are saying: I am NOT at war with Wiz57; NOR do I think he is at war with me; thus there is no war. Neither of us are harassing each other here or otherwise from my current point of view. Maybe you know something; I am not sure what it is you know.
But, now, you are drawing more attention to something I thought was past each of us.
Anyway as I share, in this thread, I have not found good experiences with USB over the last 2 decades in the performance they provide ESPECIALLY with data writes in situations like that, with session data that is kept current or any files where there is multiple read-write I/O cycles. Further, excepting for SAMSUNGs and 2 of the 3 Chinese USB 128GB purchases at the end of last year, the performance did NOT match their claims; in many cases around 5MB/sec with measurements in both Linux and MS PCs. And, I have had more corruption on USB than all of my HDDs over the past decade requiring 'e2fsck' to resolve...too many times.
So my recommendation is that for something as important as one's session files/folders, a safer bet with good performance is to use one's system-drive for your PUP's sessions. Performance would be good and corruption percentage would favor the user.
On the OP's problem, I think @wizard suggestion of an download corruption "could" be the OP's problem: It brings back a memory from last year that I had using SLCPUP64 (I think) where I could boot to desktop and some things worked...but it ultimately turned out to be a bad download. I had not had one of those for years, but, it can occur and as I am an example, it does occur.
I merely posted the recommendation for user consideration for active files that are used by the system like session file-folders.
No offense to anyone and I am NOT having a go at you. And I do KNOW that many 'love' USB for its convenience. I, too, use them for convenience mainly in a write-once, read-many uses: as I have learned that is safest and best use to avoid problems. And, except, as I have said, only 2 of them give what I consider 'good' performance.
BTW: I just took a tally, I have 38 USB sticks in a collection over the decades...from 2GB to recent 128GB (3).