Hi,
I am running the latest version and tried to import RIS-files that I got from the national research library of norway today (ask.bibsys.no).
This failed with the message that BibDesk was unable to parse the content and that the text file did not recognize any data in the file. Typically, an entry in the file, looks like this:
Bibdesk failing to import RIS-files
As the message indicates, your data is probably not properly formatted RIS. However, I can't say for sure without seeing the data. Could you attach the RIS file to this tracker or send it to me off-list?