Whenever I change a file in mono develop and switch back to unity I get a message
'Opening file Library/FailedAssetImports.txt failed because permission for the file was denied'
Now, this might be trivial, but I am new to Mac so I have no idea what to do :)
Drill down into the directory of the last project opened. Find the Library directory and set permissions for the file FailedAssetsImports.txt from Read Only to Read/Write.