After installing the latest nightly build I lost the ability to open the Bookmarks folder in the Bookmarks Bar. I was able to open the Favourite sites folder but some of my bookmarks are used too infrequently to be included there. Instead of opening when the Bookmarks icon is clicked Safari tries to go back to a previous page but does so very slowly.
This broke with <http://trac.webkit.org/changeset/46298>. The console shows: -[WebHTMLView pageTitle]: unrecognized selector sent to instance 0x1017a04a0 *** WebKit discarded an uncaught exception in the webView:decidePolicyForMIMEType:request:frame:decisionListener: delegate: <NSInvalidArgumentException> -[WebHTMLView pageTitle]: unrecognized selector sent to instance 0x1017a04a0
http://trac.webkit.org/changeset/46384
*** Bug 27678 has been marked as a duplicate of this bug. ***
*** Bug 27728 has been marked as a duplicate of this bug. ***
*** Bug 27710 has been marked as a duplicate of this bug. ***
*** Bug 27692 has been marked as a duplicate of this bug. ***