On a side note, there is nothing wrong with saving to a memory card containing FMCB. If you install FMCB with the SCPH-10000 for the SCPH-10000, there is no need for any special installation type those are for supporting other consoles, other than the one used for installation. There are ways to get the new versions to work on such a card, like to install it normally with a newer console and renaming the file for this PS2 - but it is more complicated. If you have such a compatible card and do not intend to replace it: then perhaps you might want to continue with v1.8c. The old FMCB versions from the past lacked the kernel update, which was why they once came as a single executable file. A genuine card will have a Sony chip within. If you do not kind, you could determine whether it is a compatible card by opening it.
If that is the case, I have a theory: your memory card is a compatible, which bugs out once a 2nd KELF is binded. Main menu of browser did not look any different). A telltale sign is that it had no hacked OSDSYS (I.e. What was your original FMCB version? If it was really from 2012, then it might have been v1.8c.
