Hi
I have encountered serious problems with the Default Folder app on Mac 10.9 together with Cubase 8. Crash on start-up
Are you sure you’re running the latest version of Default Folder?
I too get occasional crashes with the latest Default Folder X beta (if I remember correctly, it isn’t only in conjunction with Cubase though), but it is usually not serious, and loads just fine next time 
.
It’s been a problem for a few months now
Actually not quite correct…
It crashes Cubase 8 when it’s in 64bit mode…it’s fine in 32bit in Mavericks.
StClair soft are aware of the situation and trying to get some co-operation from Steiny to solve the problem.
It’s got something to do with changes in Default Folder for Yosemite compatibility.
In the meantime you can add Cubase 8 to the ‘advanced’ exceptions in Default Folder until things are sorted out…not ideal,
but then I’m still working in Mountain Lion for the moment, and it’s fine in both modes there.
A fix will be coming soon.
Good news. I have been informed that a new update of DFX will be available tomorrow. The update primarily fixes the conflict with Cubase.
Super! Thanks, Weasel 
(although this hasn’t happened to me for ages now… dunno what changed 
)
It’s out! The nightmare is over! 