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If your posting key allows you to log into steemit then your keys should be fine.

My first suggestion is to make sure you are copy and pasting the key correctly, something as small as a space after the password can give an error.

To login to DSound you need to use your username (e.g. wrighty without any @ character) and the posting private key (e.g. 5dfsoifsdifsdsd... not the one that starts with STM...)
If it still doesn't work out for you, please share a bit more of the problem you are having, so that I can be of more help. Thanks.

Yes, this is what I have been posting attempting to log in, same details have me logged in here, but tried again as per your instructions. I wish there was more to share apart from not being able to log in with these details.

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