Blueprint library gone after 0.17.x update

[Cairath]

after switching to 0.17.9 is guess, my whole BP library was gone. i noticed it just now at 0.17.14 after making a new save....

is there any way to restore the old file or do i have to start again?
If so, what file do i need to backup manually to avoid such error from striking again.

Cheers

[TruePikachu]

NaB if the issue came about from going to 0.17 then switching back to 0.16. If they don't appear in 0.17, check for the file `blueprint-storage.dat` (same directory as the logfiles would be in) and upload it.

[Cairath]

i did not switched back to 0.16, the library is just empty, like i never had any.

edit: sorry, just checked, i already imported some BP Books into this Libary, cause you know, can't play with out em anymore.
but my old collection might be in there somewhere?