diff --git a/prototype/corfurl/src/corfurl_client.erl b/prototype/corfurl/src/corfurl_client.erl
index 8ec895d..2edac44 100644
--- a/prototype/corfurl/src/corfurl_client.erl
+++ b/prototype/corfurl/src/corfurl_client.erl
@@ -20,7 +20,7 @@
 
 -module(corfurl_client).
 
--export([append_page/2, read_page/2, fill_page/2, trim_page/2]).
+-export([append_page/2, read_page/2, fill_page/2, trim_page/2, scan_forward/3]).
 -export([restart_sequencer/1]).
 
 -include("corfurl.hrl").
@@ -76,11 +76,30 @@ append_page2(Proj, LPN, Page) ->
 read_page(Proj, LPN) ->
     retry_loop(Proj, fun(P) -> corfurl:read_page(P, LPN) end, 10).
 
+fill_page(Proj, LPN) ->
+    retry_loop(Proj, fun(P) -> corfurl:fill_page(P, LPN) end, 10).
+
 trim_page(Proj, LPN) ->
     retry_loop(Proj, fun(P) -> corfurl:trim_page(P, LPN) end, 10).
 
-fill_page(Proj, LPN) ->
-    retry_loop(Proj, fun(P) -> corfurl:fill_page(P, LPN) end, 10).
+scan_forward(Proj, LPN, MaxPages) ->
+    %% This is fiddly stuff that I'll get 0.7% wrong if I try to be clever.
+    %% So, do something simple and (I hope) obviously correct.
+    %% TODO: do something "smarter".
+    case corfurl:scan_forward(Proj, LPN, MaxPages) of
+        {error_badepoch, _LPN2, _MoreP, _Pages} = Res ->
+            case poll_for_new_epoch_projection(Proj) of
+                {ok, NewProj} ->
+                    {Res, NewProj};
+                _Else ->
+                    %% TODO: What is the risk of getting caught in a situation
+                    %% where we can never make any forward progress when pages
+                    %% really are being written?
+                    {Res, Proj}
+            end;
+        Res ->
+            {Res, Proj}
+    end.
 
 %%%%% %%%%% %%%%% %%%%% %%%%% %%%%% %%%%% %%%%% %%%%% 
 
diff --git a/prototype/corfurl/test/corfurl_pulse.erl b/prototype/corfurl/test/corfurl_pulse.erl
index f6ae41e..48491a7 100644
--- a/prototype/corfurl/test/corfurl_pulse.erl
+++ b/prototype/corfurl/test/corfurl_pulse.erl
@@ -118,14 +118,14 @@ command(#state{run=Run} = S) ->
        || not S#state.is_setup] ++
       [{50, {call, ?MODULE, append, [Run, gen_page(PageSize)]}}
        || S#state.is_setup] ++
-      %% [{15, {call, ?MODULE, read_approx, [Run, gen_approx_page()]}}
-      %%  || S#state.is_setup] ++
-      %% [{15, {call, ?MODULE, scan_forward, [Run, gen_scan_forward_start(), nat()]}}
-      %%  || S#state.is_setup] ++
-      %% [{12, {call, ?MODULE, fill, [Run, gen_approx_page()]}}
-      %%  || S#state.is_setup] ++
-      %% [{12, {call, ?MODULE, trim, [Run, gen_approx_page()]}}
-       %% || S#state.is_setup] ++
+      [{15, {call, ?MODULE, read_approx, [Run, gen_approx_page()]}}
+       || S#state.is_setup] ++
+      [{15, {call, ?MODULE, scan_forward, [Run, gen_scan_forward_start(), nat()]}}
+       || S#state.is_setup] ++
+      [{12, {call, ?MODULE, fill, [Run, gen_approx_page()]}}
+       || S#state.is_setup] ++
+      [{12, {call, ?MODULE, trim, [Run, gen_approx_page()]}}
+       || S#state.is_setup] ++
       [{10, {call, ?MODULE, stop_sequencer, [Run, gen_stop_method()]}}
        || S#state.is_setup] ++
       [])).
@@ -740,8 +740,7 @@ append(#run{proj=OriginalProj}, Page) ->
              put_projection(Proj2),
              perhaps_trip_append_page(?TRIP_no_append_duplicates, Res, Page)
          catch X:Y ->
-                 io:format("APPEND ~p\n", [{error, append, X, Y, erlang:get_stacktrace()}]),
-                 {error, append, X, Y, erlang:get_stacktrace()}
+                 {caught, ?MODULE, ?LINE, X, Y, erlang:get_stacktrace()}
          end).
 
 read_result_mangle({ok, Page}) ->
@@ -755,10 +754,13 @@ read_approx(#run{proj=OriginalProj}, SeedInt) ->
     Proj = get_projection(OriginalProj),
     LPN = pick_an_LPN(Proj, SeedInt),
     ?LOG({read, LPN},
-         begin
-             Res = read_result_mangle(corfurl:read_page(Proj, LPN)),
-             put_projection(Proj),
-             perhaps_trip_read_approx(?TRIP_bad_read, Res, LPN)
+         try
+             {Res, Proj2} = corfurl_client:read_page(Proj, LPN),
+             put_projection(Proj2),
+             Res2 = read_result_mangle(Res),
+             perhaps_trip_read_approx(?TRIP_bad_read, Res2, LPN)
+         catch X:Y ->
+                 {caught, ?MODULE, ?LINE, X, Y, erlang:get_stacktrace()}
          end).
 
 scan_forward(#run{proj=OriginalProj}, SeedInt, NumPages) ->
@@ -773,10 +775,12 @@ scan_forward(#run{proj=OriginalProj}, SeedInt, NumPages) ->
     %% it appear as if each LPN result that scan_forward() gives us came
     %% instead from a single-page read_page() call.
     ?LOG({scan_forward, StartLPN, NumPages},
-         begin
+         try
              TS1 = lamport_clock:get(),
-             case corfurl:scan_forward(Proj, StartLPN, NumPages) of
-                 {ok, EndLPN, MoreP, Pages} ->
+             case corfurl_client:scan_forward(Proj, StartLPN, NumPages) of
+                 {{Res, EndLPN, MoreP, Pages}, Proj2}
+                   when Res == ok; Res == error_badepoch ->
+                     put_projection(Proj2),
                      PageIs = lists:zip(Pages, lists:seq(1, length(Pages))),
                      TS2 = lamport_clock:get(),
                      [begin
@@ -792,6 +796,8 @@ scan_forward(#run{proj=OriginalProj}, SeedInt, NumPages) ->
                               {LPN, P} <- Pages],
                      {ok, EndLPN, MoreP, Ps}
              end
+         catch X:Y ->
+                 {caught, ?MODULE, ?LINE, X, Y, erlang:get_stacktrace()}
          end).
 
 fill(#run{proj=OriginalProj}, SeedInt) ->
@@ -800,9 +806,12 @@ fill(#run{proj=OriginalProj}, SeedInt) ->
     Proj = get_projection(OriginalProj),
     LPN = pick_an_LPN(Proj, SeedInt),
     ?LOG({fill, LPN},
-         begin
-             Res = corfurl:fill_page(Proj, LPN),
+         try
+             {Res, Proj2} = corfurl_client:fill_page(Proj, LPN),
+             put_projection(Proj2),
              perhaps_trip_fill_page(?TRIP_bad_fill, Res, LPN)
+         catch X:Y ->
+                 {caught, ?MODULE, ?LINE, X, Y, erlang:get_stacktrace()}
          end).
 
 trim(#run{proj=OriginalProj}, SeedInt) ->
@@ -811,9 +820,12 @@ trim(#run{proj=OriginalProj}, SeedInt) ->
     Proj = get_projection(OriginalProj),
     LPN = pick_an_LPN(Proj, SeedInt),
     ?LOG({trim, LPN},
-         begin
-             Res = corfurl:trim_page(Proj, LPN),
+         try
+             {Res, Proj2} = corfurl_client:trim_page(Proj, LPN),
+             put_projection(Proj2),
              perhaps_trip_trim_page(?TRIP_bad_trim, Res, LPN)
+         catch X:Y ->
+                 {caught, ?MODULE, ?LINE, X, Y, erlang:get_stacktrace()}
          end).
 
 stop_sequencer(#run{proj=OriginalProj}, Method) ->