Here's a weird one:
I booted up my OS4.1FE partition on my 4000T to discover that all of my SFS partitions (the drive has around 7 SFS partitions and 1 FFS Intl) were set to read-only, including the OS4 partition itself. Admittedly, it's been a while since I booted OS4 on this machine but I'm pretty sure SFS was operating normally the last time I did. I don't think I've changed anything in hardware or software since then. SFS 1.279 (68K) is in the RDB. The partitions all work correctly (read/write) when I boot into OS3.9. The only way I was able to get the OS4 partition usable from OS4 again was to reformat it as FFS DOS\07 and reinstall.
Any ideas as to what might have happened?