vv81,
I am not sure if what I have is the private key or not, now that you mention it.
I will try to export to another recommended wallet and see.
Have you tried to import it? If you had, trying it out on another wallet will likely have similar results. I suggest you use Electrum-LTC to test it out.
I don't know much about Litecoin's private key characteristics. I have tried to generate a wallet on liteaddress.org, it seems there are four popular formats for LTC private keys, the examples are as follows:
Private Key WIF
51 characters base58, starts with a '6'
6vNaLdpupbtZc8YLnqsWhwpLArBtj7VCqubHCwoCzkiCQpAXvNp
Private Key WIF Compressed
52 characters base58, starts with a 'T'
T8aE9fYU96zav4HLMLhx7iwucU75JsdVGs8JXirwwuvqMfaS1XxQ
Private Key Hexadecimal Format (64 characters [0-9A-F]): A4BFB9504C0A839EC1D15493C34346E0119B679EB68B39367BC9F8A60C8933E0
Private Key Base64 (44 characters): pL+5UEwKg57B0VSTw0NG4BGbZ562izk2e8n4pgyJM+A=
Though, note that there are still other formats.