There is another thread here on the Sync 3.4, which is the thread I found first. I posted in that thread issues I'm having, but perhaps this thread is the better thread. So, I will add the same information here, hope that is okay:
I've got a 19 ST. Last night, my car auto-updated to Sync 3.4. I really think the new blue color scheme looks nice, though I guess not everybody does. But, it still sucks for me. Two issues:
1. You can't search your attached storage while driving. So to change what ripped CD I want to play, I have to be stopped.
2. Apparently it can't handle as many songs/artists as it used to. I have a 500 gb SSD with about 1,000 CDs/10,000 songs. It used to take a couple of minutes to index, but, it would index it. Now, I can get to artists that start with the letter A or B and that's it. So, I can play Adele or the B-52's, etc. But, I'm out of luck playing Tool.
Argh!!!!!!