Thanks to both of you for sending the data.  It turned out that was rather obvious, and we should have been able to figure it out.  BookMacster supports 9 browsers, and if you only have, say, 3 installed, you got 6 blank menu items.

It is now fixed for the next version, 1.5.6, which will be published soon.  The blank menu items are omitted in both popups (Inspector and Bookmarkshelf ▸ Settings ▸ General).

've experienced the same. Sent trouble ticket per above.

Boy, that has to be a record. 3 minutes from question post to first response. 

I shall await the results of your research.

Boy, I must be loosing it  I could have sworn I posted about this issue and you fixed it, however I have searched the forums and can not find a post related to it.

Any way, it is minor. When in the Inspector and clicking on the 'Visit this bookmark with' drop down menu, there is a lot of white space between the two browser options available (Firefox and Safari, the only browser I have installed). I could have sworn that you made a change that filled in the blank spaces. I have included a screen shot.

What caused me to re-notice this is that I ran across similar behavior when looking at the 'By default, visit bookmarks with:' drop down menu in the 'Settings' area. When I saw this, I went back to see what you had done in the Inspector but the white space was there again.

Am I dreaming or did you fix that and then take out the fix 

Regards,