Peter Sorry for not getting back to you with this earlier. As I wrote in other post, I will send you a link to experimental version. And it has option in Preferences that allows to switch on extensive logging. Using these logs I hope I will be able to identify the problem or at least narrow down searh area.
Please, install this version, turn on loggin, play with the program for one minute, then turn logging off again. Then, please send me tonfotos.log file. You will be able to find it in your Downloads folder.