This question is in reference to Atlassian Documentation: Trust A Server's Host Key when No Button is Available to Trust It
This solution below worked for me. Had like 20 instances of plink.exe running in task manager. Once I killed all of them and tried again, the buttons came up.
Also adding a host using plink works
http://stackoverflow.com/a/12448986/985454
`plink.exe` is located in `C:\Program Files (x86)\Atlassian\SourceTree\tools\putty`
usage: `plink.exe github.com`, then confirm by `y`
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