CHIRP

I'm having problems uploading with a mac running OS 10.9.4. It gets about 20% done and stops and I get an error and the radio memory is wiped clear. Downloading works perfectly. If I try to upload something I have previously downloaded from the radio, the same error occurs, so I don't think it is an issue with the data. I was reading where someone else was having a similar issue with a different Yaesu model although it sounded like his error occurred very soon after starting the upload.

Same issue happens with both the 0.4.0 version and the daily version 20140719.

Any assistance would be appreciated.