diff --git a/basis/documents/elements/elements.factor b/basis/documents/elements/elements.factor
index f485f1bec1..0776f8f158 100644
--- a/basis/documents/elements/elements.factor
+++ b/basis/documents/elements/elements.factor
@@ -79,6 +79,13 @@ M: one-word-elt next-elt
     drop
     [ f next-word ] modify-col ;
 
+SINGLETON: word-start-elt
+
+M: word-start-elt prev-elt
+    drop one-word-elt prev-elt ;
+
+M: word-start-elt next-elt 2drop ;
+
 SINGLETON: word-elt
 
 M: word-elt prev-elt
diff --git a/basis/tools/vocabs/vocabs.factor b/basis/tools/vocabs/vocabs.factor
index ba99a41eba..4b9a72a443 100644
--- a/basis/tools/vocabs/vocabs.factor
+++ b/basis/tools/vocabs/vocabs.factor
@@ -74,8 +74,6 @@ SYMBOL: failures
 
 SYMBOL: changed-vocabs
 
-[ f changed-vocabs set-global ] "tools.vocabs" add-init-hook
-
 : changed-vocab ( vocab -- )
     dup vocab changed-vocabs get and
     [ dup changed-vocabs get set-at ] [ drop ] if ;
@@ -287,3 +285,12 @@ MEMO: all-authors ( -- seq )
     \ all-vocabs-seq reset-memoized
     \ all-authors reset-memoized
     \ all-tags reset-memoized ;
+
+SINGLETON: cache-observer
+
+M: cache-observer vocabs-changed drop reset-cache ;
+
+[
+    f changed-vocabs set-global
+    cache-observer add-vocab-observer
+] "tools.vocabs" add-init-hook
\ No newline at end of file
diff --git a/basis/ui/gadgets/sliders/sliders.factor b/basis/ui/gadgets/sliders/sliders.factor
index 6cfb83a49a..80829d7b66 100644
--- a/basis/ui/gadgets/sliders/sliders.factor
+++ b/basis/ui/gadgets/sliders/sliders.factor
@@ -53,8 +53,8 @@ CONSTANT: min-thumb-dim 30
     [ slider-max* 1 max ]
     bi / ;
 
-: slider>screen ( m slider -- n ) slider-scale * elevator-padding + ;
-: screen>slider ( m slider -- n ) [ elevator-padding - ] dip slider-scale / ;
+: slider>screen ( m slider -- n ) slider-scale * ;
+: screen>slider ( m slider -- n ) slider-scale / ;
 
 M: slider model-changed nip elevator>> relayout-1 ;
 
@@ -133,7 +133,7 @@ elevator H{
         swap >>orientation ;
 
 : thumb-loc ( slider -- loc )
-    [ slider-value ] keep slider>screen ;
+    [ slider-value ] keep slider>screen elevator-padding + ;
 
 : layout-thumb-loc ( thumb slider -- )
     [ thumb-loc ] [ orientation>> ] bi n*v
diff --git a/basis/ui/gestures/gestures.factor b/basis/ui/gestures/gestures.factor
index c7db0839d7..7e038ef2e0 100644
--- a/basis/ui/gestures/gestures.factor
+++ b/basis/ui/gestures/gestures.factor
@@ -310,16 +310,16 @@ HOOK: keysym>string os ( keysym -- string )
 
 M: macosx keysym>string >upper ;
 
-M: object keysym>string ;
+M: object keysym>string dup length 1 = [ >lower ] when ;
 
 M: key-down gesture>string
     [ mods>> ] [ sym>> ] bi
     {
         { [ dup { [ length 1 = ] [ first LETTER? ] } 1&& ] [ [ S+ prefix ] dip ] }
         { [ dup " " = ] [ drop "SPACE" ] }
-        [ keysym>string ]
+        [ ]
     } cond
-    [ modifiers>string ] dip append ;
+    [ modifiers>string ] [ keysym>string ] bi* append ;
 
 M: button-up gesture>string
     [
diff --git a/basis/ui/tools/browser/browser.factor b/basis/ui/tools/browser/browser.factor
index a493d5d7d2..1b8af1dd03 100644
--- a/basis/ui/tools/browser/browser.factor
+++ b/basis/ui/tools/browser/browser.factor
@@ -25,7 +25,10 @@ M: browser-gadget set-history-value
 
 : show-help ( link browser-gadget -- )
     [ >link ] dip
-    [ [ add-recent ] [ history>> add-history ] bi* ]
+    [
+        2dup model>> value>> =
+        [ 2drop ] [ [ add-recent ] [ history>> add-history ] bi* ] if
+    ]
     [ model>> set-model ]
     2bi ;
 
diff --git a/basis/ui/tools/listener/completion/completion.factor b/basis/ui/tools/listener/completion/completion.factor
index 17216bd656..fdba400c3d 100644
--- a/basis/ui/tools/listener/completion/completion.factor
+++ b/basis/ui/tools/listener/completion/completion.factor
@@ -39,7 +39,7 @@ M: history-completion completion-quot drop '[ drop _ history-list ] ;
 
 GENERIC: completion-element ( completion-mode -- element )
 
-M: object completion-element drop one-word-elt ;
+M: object completion-element drop word-start-elt ;
 M: history-completion completion-element drop one-line-elt ;
 
 GENERIC: completion-banner ( completion-mode -- string )
@@ -72,13 +72,13 @@ M: vocab-completion row-color
     drop vocab? COLOR: black COLOR: dark-gray ? ;
 
 : complete-IN:/USE:? ( tokens -- ? )
-    2 short tail* { "IN:" "USE:" } intersects? ;
+    1 short head* 2 short tail* { "IN:" "USE:" } intersects? ;
 
 : chop-; ( seq -- seq' )
     { ";" } split1-last [ ] [ ] ?if ;
 
 : complete-USING:? ( tokens -- ? )
-    chop-; { "USING:" } intersects? ;
+    chop-; 1 short head* { "USING:" } intersects? ;
 
 : complete-CHAR:? ( tokens -- ? )
     2 short tail* "CHAR:" swap member? ;
diff --git a/core/vocabs/vocabs.factor b/core/vocabs/vocabs.factor
index 2b978e8666..73ffd1a80c 100644
--- a/core/vocabs/vocabs.factor
+++ b/core/vocabs/vocabs.factor
@@ -1,7 +1,7 @@
 ! Copyright (C) 2007, 2009 Eduardo Cavazos, Slava Pestov.
 ! See http://factorcode.org/license.txt for BSD license.
 USING: accessors assocs strings kernel sorting namespaces
-sequences definitions ;
+sequences definitions init ;
 IN: vocabs
 
 SYMBOL: dictionary
@@ -65,8 +65,24 @@ M: object vocab-main vocab vocab-main ;
 
 M: f vocab-main ;
 
+SYMBOL: vocab-observers
+
+GENERIC: vocabs-changed ( obj -- )
+
+[ V{ } clone vocab-observers set-global ] "vocabs" add-init-hook
+
+: add-vocab-observer ( obj -- )
+    vocab-observers get push ;
+
+: remove-vocab-observer ( obj -- )
+    vocab-observers get delq ;
+
+: notify-vocab-observers ( -- )
+    vocab-observers get [ vocabs-changed ] each ;
+
 : create-vocab ( name -- vocab )
-    dictionary get [ <vocab> ] cache ;
+    dictionary get [ <vocab> ] cache
+    notify-vocab-observers ;
 
 ERROR: no-vocab name ;
 
@@ -99,7 +115,8 @@ M: string >vocab-link dup vocab [ ] [ <vocab-link> ] ?if ;
 
 : forget-vocab ( vocab -- )
     dup words forget-all
-    vocab-name dictionary get delete-at ;
+    vocab-name dictionary get delete-at
+    notify-vocab-observers ;
 
 M: vocab-spec forget* forget-vocab ;