CRC ₡ symbol missing in invoice - marked with ?mark

[Gronskov]

Hi,

I've made a webshop with 1.7.6.8 and are using spanish as default language, both in fontend and backend.

When trying to print an invoice, in the backoffice, the currency is marked as question mark instead of colonnes ₡ (CRC)

I have made the prefix invoice as #CU (for cuenta, explained somewhere in the documentation)

However when generating a PDF its shown with an question mark.

The crazy thing is when I change the backoffice into english the PDF shows the symbol of colonnes ₡.

Does any have a remedy to solved this issue?