Sorry, I just double checked : only the 'connect' command requires the .bkmk but the other commands do not.
Just to be clear the connect command requires Lomax.bkmk and all the others require just Lomax
If you still have issues you could revert to the 1.7.2 release version, just download it from the Yummy Software site, however since you have used the newer beta then all your Bookmark files will have .bkmk extensions. Although they are 'invisible' they will be there and since v1.7.2 knows nothing about the extension this means you'll still have to alter your script.
For 1.7.2 you might need to make all the commands use Lomax.bkmk