Szurkebarat,
I have taken a look at your PM.log file. First, it is incredibly large at nearly 107 MB in size.
I see places where disks are unable to be unmounted, but the error from the OS is not returning the process ID of the application that has an open file on the disk.
[Sat Jul-28-2012 15:57:37.066][a04de540] AppUtils.mm:349 ($Revision$) AppUtils::EjectPathInFinder() failed, dissenter pid:0
[Sat Jul-28-2012 15:57:37.067][a04de540] AppUtils.mm:297 ($Revision$) findAppWithPID() pid:0
[Sat Jul-28-2012 15:57:37.086][a04de540] AppUtils.mm:323 ($Revision$) findAppWithPID() pid:0 has no match
[Sat Jul-28-2012 15:57:49.287][a04de540] AppUtils.mm:349 ($Revision$) AppUtils::EjectPathInFinder() failed, dissenter pid:0
[Sat Jul-28-2012 15:57:49.287][a04de540] AppUtils.mm:297 ($Revision$) findAppWithPID() pid:0
[Sat Jul-28-2012 15:57:49.289][a04de540] AppUtils.mm:323 ($Revision$) findAppWithPID() pid:0 has no match
I think maybe your system is having some significant problems. For instance, I see thousands of messages like this:
[Fri Jul-20-2012 21:16:35.901][b098c000] CachedImage.cpp:1866 ($Revision$) CCachedImage::GetImageInfoPtr() unable to get shallow iip for '/Volumes/EOS_DIGITAL 1/DCIM/101GOPRO/GOPR8840.JPG'
[Fri Jul-20-2012 21:16:35.913][b0b12000] CachedImage.cpp:1866 ($Revision$) CCachedImage::GetImageInfoPtr() unable to get shallow iip for '/Volumes/EOS_DIGITAL/DCIM/101GOPRO/GOPR3076.JPG'
Notice how there are two volumes named EOS_DIGITAL: one is "EOS_DIGITAL" and the other is "EOS_DIGITAL 1". This indicates that the card wasn't unmounted properly by the OS and then was remounted and when the OS saw that EOS_DIGITAL already existed it tacked " 1" onto the name and created a new mount point. This also isn't good.
Here is an other exchange of problems:
[Sun Jul-29-2012 17:13:18.459][b0210000] NRFCR2.cpp:356 ($Revision$) Failed to read 64 bytes at end of file "/Volumes/EOS_DIGITAL/DCIM/101EOS1D/AP5I4079.CR2"
[Sun Jul-29-2012 17:13:18.480][b0210000] CachedImage.cpp:1861 ($Revision$) Error returned by NRFGetImageInfo("/Volumes/EOS_DIGITAL/DCIM/101EOS1D/AP5I4079.CR2"): 5
[Sun Jul-29-2012 17:13:18.492][b0210000] CachedImage.cpp:1861 ($Revision$) Error returned by NRFGetImageInfo("/Volumes/EOS_DIGITAL/DCIM/101EOS1D/AP5I4079.CR2"): 1
[Sun Jul-29-2012 17:13:18.510][b07bb000] NRFCR2.cpp:230 ($Revision$) Failed reading CR2 header for file "/Volumes/EOS_DIGITAL 1/DCIM/100EOS1D/JP4F5709.CR2"
[Sun Jul-29-2012 17:13:18.510][b07bb000] CachedImage.cpp:1861 ($Revision$) Error returned by NRFGetImageInfo("/Volumes/EOS_DIGITAL 1/DCIM/100EOS1D/JP4F5709.CR2"): 4099
[Sun Jul-29-2012 17:13:18.511][b07bb000] CachedImage.cpp:1861 ($Revision$) Error returned by NRFGetImageInfo("/Volumes/EOS_DIGITAL 1/DCIM/100EOS1D/JP4F5709.CR2"): 1
Have you checked your disks and RAM for problems?
These same issues may explain why your crops randomly stop working and then work again later.
-Kirk