Hi Gerard,
Thank you for the crash information. Yosemite shipped with a number of bugs and we have these bugs open with Apple, in the meantime we are also trying to find work arounds for the bigger ones. Please do email us the crash logs for any crashes so that we can make sure that it's the same bugs that we are aware of. Also it might give us more information to find the work around.
In the meantime do try this small change that might make it better. Run the program called Terminal in your /Applications/Utilities folder and copy paste the lines below and press return. It will disable one of the barcode scanners, that is the only one we have seen a handful of users have issues with under Yosemite.
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defaults write com.bruji.dvdpedia "BarcodeScannerDisableNewiMac" -bool YES
defaults write com.bruji.cdpedia "BarcodeScannerDisableNewiMac" -bool YES
defaults write com.bruji.bookpedia "BarcodeScannerDisableNewiMac" -bool YES
Regards,
Conor