I've also migrated from 4.3 to 5.0 but noticed a few issues:
My shares lost their rights / not visibile in file browser
IP config is lost
SAB/Couch etc. still work
I can't get the ODD drive to work (raid failure at this moment)
I;ve edited the config files :
type “vi /etc/synoinfo.conf” press “I” then type the lines below.
esataportcfg=0x30
internalportcfg=0xf
usbportcfg=0x1FC0
But where do I put the new lines? at the top?