Deletion not possible - error messages

Hi,

in biblioscape 7.4., when I try to delete (duplicate, erratic) references, I keep getting the error messages "Cannot perform operation on closed dataset" - what to do?

Thanks
Johanna

Johanna, please restart

Johanna, please restart Biblioscape and see if you can reproduce it. If yes, please zip all the files under your database folder and let me know the place to download the zip.