Ok, just tried the new version...
I flashed RR 3.8P rom with an earlier version of binplugin, the new plugin did not identify it when I tried to flash again (different checksums). Then I tried to flash it onto the lower bank, I got "ram check: error" and now it finds RR 3.8P on the upper bank. It says "Erasing error Press R to retry". I retried and get no error, but RR 3.8P is still only identified on the upper bank. Now on the third attempt at programming the Lower Bank it works and the Lower and Upper Banks are identified as RR3.8P.
I now restart and try to flash jawbreaker. It says "warning bank select jumper may be open", it is closed (I don't understand if it should be closed or open anyway). RR 3.8P is identified in both banks, I now try to flash the lower bank. It works fine!
I now try to flash the Upper Bank with Jukebox. Works fine!
Testing games: Bank select jumper closed: Jawbreaker works fine. Jumper open, jukebox works!
Now I flash back RR 3.8P onto the Lower Bank - works perfectly!
Looks like I got unlucky on the 1st attempt, but from then on, all works fine. I like the way you can't exit until flash jumper is removed!
Thanks for a great plugin!
Ed