diff --git a/src/apex/taskstubs_implementation.cpp b/src/apex/taskstubs_implementation.cpp
index 97a35091..113870bf 100644
--- a/src/apex/taskstubs_implementation.cpp
+++ b/src/apex/taskstubs_implementation.cpp
@@ -213,8 +213,10 @@ extern "C" {
     }
 
     void tasktimer_command_start_impl(const char* type_name) {
+        // we need to create a unique GUID for the command
+        static tasktimer_guid_t guid{UINT64_MAX/2};
         std::string tmpstr{type_name};
-        auto task = apex::new_task(tmpstr);
+        auto task = apex::new_task(tmpstr, guid++);
         timerStack(task, true);
     }
 
diff --git a/src/scripts/apex-treesummary.py b/src/scripts/apex-treesummary.py
index b3f3f84c..8f5b4759 100755
--- a/src/scripts/apex-treesummary.py
+++ b/src/scripts/apex-treesummary.py
@@ -230,7 +230,7 @@ def drawDOT(df, args, name):
     df.loc[df['calls'] == 0, 'bytes per call'] = df['total bytes']
     metric = 'bytes per call'
     # Make a new dataframe from rank 0
-    filename = name + 'tasktree.dot';
+    filename = name.replace(' ', '-') + '-tasktree.dot';
     f = open(filename, 'w')
     f.write('digraph prof {\n')
     #f.write(' label = "(get this from metadata file output - or, generate it from apex-treesummary.py!)";\n')