It's clear that .40 needs a full controlled test as I'm seeing a lot of weirdness this morning but don't have time to dig deep. Here's the situation.
As reported earlier, .40 mixes tracks with have the same Album Name. Last night I removed my USB stick, renamed all the files to strip away the Disk-Track numbers, and then reinserted it. It began indexing all over again so I went to bed. Here is what I saw this morning.
1. The disk-track numbers were still listed. I double checked the USB stick this morning in my computer and the files are definitely renamed. So apparently it did not completely re-index.
2. Tracks are presented in what appears to be random order.
3. In the Artist or Album view, tracks from different artists of the same Album Name are mixed together.
4. Album Art from one Album is being used for the Album with the same name by a different artist.
This is not a nice definitive test like
@BertL would provide, but it's clear to me that while restoring the scroll by alphabetical letter, .40 has introduced its own set of problems.