Version 1.6.0 works for me on a Bold with 4.6. I haven't had any problems with it. I think I am using the "Blackberry Enterprise Only Build", but I can't find anything in the "About MidpSSH" screen to confirm that this is the version that I downloaded.
This is the version I used on my 8900 which works perfectly.
I went to http://xk72.com/wap/ on my blackberry's browser. I then chose Latest Development Release (v1.7.3). Then scrolled down and chose Blackberry Build for OS 4.