On top of this it has wiped all of my libraries on JR15 and deleted all of my backups!
... but I have no idea where all of my Libraries and Backups went.
Why is JR16 reffering back to JR15 Libraries, i set up separate folders, it's like it just defaults back to stuff.
Have you actually checked the MC15 library backup folder outside MC? Are also the disk files missing or are the backup zip files just missing from the initial view of the "Restore" window when you open it?
Please bring back the library manager function so that we can have better transparency of the Libraries. It will also allow us to delete them.
The previous functions are included in the new system. The only thing that you cannot do is to remove or move the new "Main Library" item. You can rename it though. I guess this is some kind of safeguard against a situation in which MC could not load any library. The library handling changes have been discussed and explained in some recent threads.
HKEY_CURRENT_USER\Software\JRiver\Media Center 16\Player Core
Output Plugin Path REG_SZ [Install Path]Plugins\out_main.dll
Output Plugin Path REG Output Plugin Path (10000) REG_SZ C:\Program Files (x86)\J River\Media Center 15\Plugins\out_main.dll
Output Plugin Path REG Output Plugin Path (10002) REG_SZ C:\Program Files (x86)\J River\Media Center 15\Plugins\out_main.dll
Output Plugin Path REG Output Plugin Path (10003) REG_SZ C:\Program Files (x86)\J River\Media Center 15\Plugins\out_main.dll
Output Plugin Path REG Output Plugin Path (10004) REG_SZ C:\Program Files (x86)\J River\Media Center 15\Plugins\out_main.dll
So four of the five zones try to use the MC15 out_main.dll path. You can change them to point to [Install Path]Plugins\out_main.dll, but this makes me wonder what else in the registry might incorrectly point to the MC15 program location.
For instance the "lost" MC15 library (or is it libraries?) may indicate that MC16 has accessed the library files and converted them to the new format, which is incompatible with MC15. Though I don't know what kind of error message would then show up (if any).
How did you actually install MC16 and restore your libraries to it? Did you edit the Windows registry anyhow?
For comparison, here are my "out_main.dll" registry values:
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\JRiver\Media Center 15\Player Core]
"Output Plugin Path"="C:\\Program Files\\MC15\\Plugins\\out_main.dll"
"Output Plugin Path (10000)"="C:\\Program Files\\MC15\\Plugins\\out_main.dll"
"Output Plugin Path (10007)"="C:\\Program Files\\MC15\\Plugins\\out_main.dll"
"Output Plugin Path (10064)"="C:\\Program Files\\MC15\\Plugins\\out_main.dll"
"Output Plugin Path (10123)"="C:\\Program Files\\MC15\\Plugins\\out_main.dll"
"Output Plugin Path (10124)"="C:\\Program Files\\MC15\\Plugins\\out_main.dll"
"Output Plugin Path (10130)"="C:\\Program Files\\MC15\\Plugins\\out_main.dll"
"Output Plugin Path (10136)"="C:\\Program Files\\MC15\\Plugins\\out_main.dll"
"Output Plugin Path (10150)"="[Install Path]Plugins\\out_main.dll"
Windows Registry Editor Version 5.00
[HKEY_CURRENT_USER\Software\JRiver\Media Center 16\Player Core]
"Output Plugin Path"="[Install Path]Plugins\\out_main.dll"
"Output Plugin Path (10000)"="[Install Path]Plugins\\out_main.dll"
"Output Plugin Path (10007)"="[Install Path]Plugins\\out_main.dll"
"Output Plugin Path (10064)"="[Install Path]Plugins\\out_main.dll"
"Output Plugin Path (10123)"="[Install Path]Plugins\\out_main.dll"
"Output Plugin Path (10124)"="[Install Path]Plugins\\out_main.dll"
"Output Plugin Path (10130)"="[Install Path]Plugins\\out_main.dll"
"Output Plugin Path (10136)"="[Install Path]Plugins\\out_main.dll"
"Output Plugin Path (10150)"="[Install Path]Plugins\\out_main.dll"
Apparently only the last MC15 value points to "Install Path". The older values point directly to the MC15 program location. This is probably caused by a change in MC15.
MC16 has changed all values to point to "Install Path".