shotwell fails to import images from folder (it seems to try and copy the files over themselves)

I have some images from my Canon S5 IS I was unable to mount via PTP on this up to date Trusty machine, so I used a memory card reader and copied the files to a local directory. I'm importing with "import from folder" and selecting "copy" rather than "import in place". All the input files are seen, but none are imported.

The error log shows entries like the following:

couldn't copy /home/bbogart/tmp/images/IMG_0201.JPG
 to /home/bbogart/tmp/images/IMG_0201.JPG
 error message: Error creating directory: Permission denied

This seems to indicate that the source and destination are the same (source) filename, and the import fails due to trying to overwrite the files in place.

Why would shotwell be trying to copy the files to the source location? My photos are in ~/Photos and this is properly set in the preferences.

ProblemType: Bug
DistroRelease: Ubuntu 14.04
Package: shotwell 0.18.0-0ubuntu4.3
ProcVersionSignature: Ubuntu 3.13.0-53.89-generic 3.13.11-ckt19
Uname: Linux 3.13.0-53-generic i686
NonfreeKernelModules: nvidia
ApportVersion: 2.14.1-0ubuntu3.11
Architecture: i386
Date: Fri May 22 16:16:21 2015
InstallationDate: Installed on 2014-12-31 (142 days ago)
InstallationMedia: Xubuntu 12.04.4 LTS "Precise Pangolin" - Release i386 (20140205)
SourcePackage: shotwell
UpgradeStatus: Upgraded to trusty on 2014-12-31 (141 days ago)