Do you have the latest version of iReal Pro? (6.0)
In iReal Pro, go to Window/Show Sidebar.
I'm having the same problem on my mid 2012 Macbook pro. I do have Ireal Pro 6.0 installed. I'm running 6.0 on my 2011 iMac which I have not updated to Yosemite yet and 6.0 is working fine.
I just installed on my late 2013 MacBookPro running Yosemite, and it's running fine here. No issues that I can see.
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