I recently had a problem getting STARTTLS working on exim4 on Debian 4.0 (Etch). It kept reporting:
TLS error on connection from host (ehlo) [ip] (cert/key setup: cert=/etc/ssl/certs/whatever.crt key=/etc/ssl/private/whatever.key: Base64 decoding error.
This was confirmed by running gnutls-serv --debug 5 --x509certfile foo.crt --x509keyfile foo.key, which reported the same error.
Because I might want to get on with something else while your program loads, and if your splash screen is in the way, that's going to make it difficult.
Yes, I'm talking to you, PaintShop Pro.