Strangely, I use JRiver on three different computers and only have problems on one of them.
The one I have problems with has two different libraries: one refers to an internal HDD, and the other to a NAS (WD MYCloud). I keep the libraries on that computer separate as the internal HDD is my entire music collection converted for my SONOS system, which can't play hi-rez files; and the NAS is a curated subset of that music for the SONOS system to access without turning the computer on, and is a subset of my entire collection because I have too many files for the database in the SONOS system to cope with.
In Bitdefender I have excluded JRiver MC26 from the work profile, and excluded media files from Scans (I presume you meant that rather than scabs); and I have turned off automatic updating in JRiver.
But still it constantly freezes.
Weird huh?
PS for Matt - I did originally post crash dump zip files, and can re-post if it's useful next time I'm at that computer.