Ok, I think we may not have a problem. I do stress the word "may".
About 2 months ago, I changed my SSD file structure so that I would get Artist/Album/Song order where the songs would start with the 2 digit track #.
I have 12,313 songs. After Format Read, it would play the first song and it would show 1 of 1113. I freaked out...I should have 12,313 songs, not 1,113. If I left the USB screen and came back, the available song number would get higher. It would show 1 of 1213, then 1313, etc..all the way to 12,313. The process was slow...but eventually it recognized all 12,313.
Shut the car off...and then get back in car and the NEX would do the format read. Instead of showing 1 of 1113...it would show a higher number. Each time I shut my car off and get back in, the number would get higher. Eventually, I would start my car and it would finally show all 12,313 available songs.
Now, during this long processing time...each time I started the car up....it would start with the same song, the first alphabetical song. No matter what. No audio resume whatsoever. But, when the process finally recognized all 12,313 songs at car startup....audio resume worked properly. I don't have a long commute, so the entire process took a little over 1 week.
Now, I believe the same thing is happening after the firmware update. I noticed the first time it showed 1,492 songs...now it is over 2,000 songs. The difference I see now is that available song number increases without having to leave the USB music screen and coming back.
It seems like the unit does a initial format read and then a deeper format read that runs in background that allows you to listen to music while it runs the deeper format read process.
I'm going to keep an eye on this and see if this theory holds true again. I have some longer road times this weekend, speeding up this process.
So bottom line is that format read process is not complete, and it takes forever...but when its done (depending on how many files you have), audio resume should work.