Hello Camilapalmeida,
We have tested the most recent version of the blender (the Mountain Lion version located
here) on Mavericks with success. We have tried it on three different computers, ranging from a 2007-era MacBook pro to a 2014 MacBook Pro, with other models in between, and the newest version of OS X seems to have actually cleared up some of the issues.
My advice is to do a clean install of the program (I know this is a bit of a pain, but unfortunately is what is usually takes to clear out all of the necessary files), following these instructions:
WARNING Please note that you will have to re-import your videos and re-create your workouts since this resets your Workout Blender. If you have workout videos successfully created already, you can easily save your "premix" workout videos themselves by dragging them out of your Workout Blender Videos folder and into iTunes or any other folder on your computer
BEFORE starting this process. You will not be able to edit these existing workout videos, however, unless you re-create them like you did originally using the Blender.
MAC
1. Exit the Workout Blender.
2. If you are in Lion or a later version of OS X, step 2 is a bit more involved. Apple decided to hide the Library folder in these versions of OS X, so you will need to do a bit of old-fashioned command line programming. Go to your Utilities folder inside your Applications folder and launch Terminal. Once the grey block cursor appears (it will be after your user name and $), carefully type
chflags nohidden ~/Library/ and hit return. Quit out of Terminal and you should now be able to navigate here: "Your Hard Drive" > Users > "Your User Name" > Library > Preferences > cathe (NB - if you would like to make the folder invisible again, in Terminal type
chflags hidden ~/Library/ )
3. Drag the folder "cathe" into the Trash and you can close all the folders you opened.
4. In your Applications folder, drag "Workout Blender" to the trash, then empty the trash.
5. Restart your computer, then when it is done restarting, re-install the Workout Blender from the link above.
6. Launch Workout Blender and attempt to import and/or create a new video.
Please let me know if this works out for you. We have been having fewer problems under Mavericks than the previous two versions of OS X; hope you have the same experience after re-installation!
