The missing options appear to be ones added to the translation files since RC7. If you were still logged into Hastymail when you upgraded that could cause what you are seeing (translation strings are cached in the session at login). But that means the problem should go away if you logout then back in again. If not then it would seem that the hastymail2/lang/en_US.php file did not get updated when you upgraded Hastymail.
Searching has a config file setting called imap_search_charset. You will want to set this to either US-ASCII or leave the setting blank. The default value is utf-8 but some IMAP servers do not support searching with that character set. I am changing the default to blank for future releases.
I have gotten so used to using the folder tree for navigation instead of the dropdown that I forgot that without the button and the folder tree hidden you can't use the dropdown to refresh the current folder. The "go" button has been added back in SVN as of revision 1261.
You can download a tarball of the latest SVN from:
http://hastymail.svn.sourceforge.net/viewvc/hastymail/trunk/hastymail2.tar.gz?view=tar
Thanks for the feedback,
Jason