@@ -283,7 +283,9 @@
             msg='';
             alldone=true;
             doneflag=aas_doneflag_getpath_bydomain(aap,domain,indices,k);
-            
+            % When used in aas_log messages, escape backward slashes from windows paths.
+            logsafe_path = strrep(doneflag, '\', '\\');
+
             % Check whether tasksettings have changed since the last execution,
             % and if they have, then delete doneflag to trigger re-execution
             if strcmp(task,'doit') && isfield(aap.options,'checktasksettingconsistency') && aap.options.checktasksettingconsistency && aas_doneflagexists(aap,doneflag)
@@ -297,7 +299,7 @@
             end
 
             if aas_doneflagexists(aap,doneflag) && strcmp(task,'doit')
-                msg=[msg sprintf('- done: %s for %s \n',description,doneflag)];
+                msg=[msg sprintf('- done: %s for %s \n',description,logsafe_path)];
             else
                 alldone=false;
                 switch (task)
@@ -329,7 +331,7 @@
                         taskmask.tobecompletedfirst=tbcf;
 
                         % now queue current stage
-                        aas_log(aap,0,sprintf('MODULE %s PENDING: %s for %s',stagename,description,doneflag));
+                        aas_log(aap,0,sprintf('MODULE %s PENDING: %s for %s',stagename,description,logsafe_path));
 
                         taskmask.indices=indices;
                         taskmask.doneflag=doneflag;
 
@@ -63,7 +63,9 @@
 
 % Now execute the module, and change the 'done' flags if task='doit'
 
-[doneflag doneflagpath stagetag]=aas_doneflag_getpath_bydomain(aap,domain,indices,modulenum);
+[doneflag, doneflagpath, stagetag]=aas_doneflag_getpath_bydomain(aap,domain,indices,modulenum);
+% When used in aas_log messages, escape backward slashes from windows paths.
+logsafe_path = strrep(doneflagpath, '\', '\\');
 outputpath=aas_getpath_bydomain(aap,domain,indices);
 aas_makedir(aap,outputpath);
 aap_tmp=aap;
@@ -72,7 +74,7 @@
 aap=aap_tmp;
 if (aas_doneflagexists(aap,doneflag))
     if (strcmp(task,'doit'))
-        aas_log(aap,0,sprintf('- completed previously: %s for %s',description,doneflagpath),aap.gui_controls.colours.completedpreviously);
+        aas_log(aap,0,sprintf('- completed previously: %s for %s',description,logsafe_path),aap.gui_controls.colours.completedpreviously);
         %                 re-write done flag as it clears dependencies
         aas_writedoneflag(aap,doneflag);
     end
@@ -92,7 +94,7 @@
                 aas_delete_doneflag_bydomain(aap,aap.internal.outputstreamdestinations{modulenum}.stream(k0i).destnumber,domain,indices);
             end
             % now run current stage
-            aas_log(aap,0,sprintf('MODULE %s RUNNING: %s for %s',stagename,description,doneflagpath),aap.gui_controls.colours.running);
+            aas_log(aap,0,sprintf('MODULE %s RUNNING: %s for %s',stagename,description,logsafe_path),aap.gui_controls.colours.running);
 
             % ...fetch inputs
             if ~isempty(aap.internal.inputstreamsources{modulenum})
 
@@ -33,6 +33,8 @@
         passed=true;
     else
         passed=false;
-        aas_log(aap,true,sprintf('Paths in aa can only contain the characters a-z, A-Z, 0-9, _, -, ., / and sometimes wildcards/colons \nYour path %s=''%s'' does not satisfy this.',nme,pth));
-    end;
+        % When used in aas_log messages, escape backward slashes from windows paths.
+        logsafe_path = strrep(pth, '\', '\\');
+        aas_log(aap,true,sprintf('Paths in aa can only contain the characters a-z, A-Z, 0-9, _, -, ., / and sometimes wildcards/colons \nYour path %s=''%s'' does not satisfy this.',nme,logsafe_path));
+    end
 end