So far my FHDB is running fine, adding games over the network works. I noticed, that sometimes the PS2 won't boot into FHDB, but goes to the normal OSD instead. I can't tell what triggers this, but rebooting once or twice helps.
What might be causing this? I'm still using an IDE drive, maybe it's just too slow and "skips a beat" sometimes during boot?
Drive was formatted with HddManager, has one extra +OPL partition and FHDB installed from USB drive (installation from memory card would not start, launching the .elf file was without effect).