Been using data manager very successfully for the last few weeks on a Windows &, 64 bit machine and it has been great. Installed the latest release on a mac today and whenever I drag a file onto the pallette, select the file name I get the error attached to this post. This is when trying to import a CSV file. I get the same when I try and import an IOK file.
Thanks for reporting this to us. This looks like a bug with the way we open Excel files on Mac's. I will investigate this and let you know once it has been resolved.