Problems with image transfer

I know this isn't quite a tech help forum, but I know that there are vast reserves of knowledge here, so maybe someone can help me...

I'm having some problems transferring images from the phone to my Mac - not happened before, has been fine with same phone Nokia 6300 and other, just seems to be happening from today

All settings on bluetooth discoverable etc, when I choose to send a picture on the phone, the phone identifies my computer right away; when I choose my computer on the phone, a dialog box pops on the Mac informing me that I have an incoming file transfer, the dialog box reads "Status: Calculating... Time Remaining: Calculating..." and the status bar goes into "barber pole" mode. Then it just hangs like this indefinitely. All this time, a dialog box on the phone screen reads "Sending data 0%."

Tried deleting bluetooth phone list and re-finding, but I still go the same hang when the file transfer process starts.

Anyone have any ideas on what I'm doing wrong here? Is there some setting I need to tweak that I haven't thought about? Thanks!