diff --git a/CHANGELOG.md b/CHANGELOG.md
index 94c33d2..c3c4a12 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,5 +1,11 @@
 # AnyPyTools Change Log
 
+## v1.20.0
+
+* Fixed a problem that prevented multiple AnyPyTools instances from running
+  simultaneously in the same process. Previously, other running AnyBody instances
+  were shut down when the first `AnyPyProcess.start_macro()` call finished.
+
 ## v1.19.2
 
 * Fixed missing widget information is user-guide documentation.
@@ -32,11 +38,6 @@
   assert results[0]["SubjectID"] == "S001"
   assert results[0]["SubjectHeight"] == 1.8
   ```
-* {meth}`results.to_dataframe()
-  <anypytools.tools.AnyPyProcessOutput.to_dataframe>` has a new argument
-  `exclude_task_info` which can exclude task information (variables starting
-  with 'task_') when exporting results to a dataframe
-
 
 ## v1.18
 
diff --git a/anypytools/__init__.py b/anypytools/__init__.py
index 4178cf1..e743d04 100644
--- a/anypytools/__init__.py
+++ b/anypytools/__init__.py
@@ -36,7 +36,7 @@
     "NORMAL_PRIORITY_CLASS",
 ]
 
-__version__ = "1.19.2"
+__version__ = "1.20.0"
 
 
 def print_versions():
diff --git a/anypytools/abcutils.py b/anypytools/abcutils.py
index 5381fc0..3baa926 100644
--- a/anypytools/abcutils.py
+++ b/anypytools/abcutils.py
@@ -60,7 +60,12 @@
 ]
 
 if ON_WINDOWS:
-    from .jobpopen import JobPopen as Popen
+    if "ANYPYTOOLS_DEBUG_USE_PYTHON_POPEN" in os.environ:
+        logger.warning("Warning: Using Python's subprocess.Popen instead of JobPopen.")
+        from subprocess import Popen
+    else:
+        from .jobpopen import JobPopen as Popen
+
     from subprocess import CREATE_NEW_PROCESS_GROUP
 else:
     from subprocess import Popen
@@ -109,8 +114,8 @@ def stop_all(self):
             self._pids.clear()
 
 
-_subprocess_container = _SubProcessContainer()
-atexit.register(_subprocess_container.stop_all)
+_global_subprocess_container = _SubProcessContainer()
+atexit.register(_global_subprocess_container.stop_all)
 
 
 def _progress_print(progress, content):
@@ -131,6 +136,7 @@ def execute_anybodycon(
     debug_mode=0,
     folder=None,
     interactive_mode=False,
+    subprocess_container=_global_subprocess_container,
 ):
     """Launch a single AnyBodyConsole applicaiton.
 
@@ -274,7 +280,7 @@ def execute_anybodycon(
     proc = Popen(cmd, **kwargs)
 
     retcode = None
-    _subprocess_container.add(proc.pid)
+    subprocess_container.add(proc.pid)
     try:
         proc.wait(timeout=timeout)
         retcode = ctypes.c_int32(proc.returncode).value
@@ -293,7 +299,7 @@ def execute_anybodycon(
             if ON_WINDOWS:
                 proc._close_job_object(proc._win32_job)
         else:
-            _subprocess_container.remove(proc.pid)
+            subprocess_container.remove(proc.pid)
 
     if retcode == _TIMEDOUT_BY_ANYPYTOOLS:
         logfile.write(f"\nERROR: AnyPyTools : Timeout after {int(timeout)} sec.")
@@ -607,6 +613,8 @@ def __init__(
             self.env = env
         else:
             self.env = None
+
+        self._local_subprocess_container = _SubProcessContainer()
         logging.debug("\nAnyPyProcess initialized")
 
     def save_results(self, filename, append=False):
@@ -778,7 +786,7 @@ def start_macro(
 
         """
         # Handle different input types
-        if isinstance(macrolist, types.GeneratorType):
+        if isinstance(macrolist, (types.GeneratorType, tuple)):
             macrolist = list(macrolist)
         if isinstance(macrolist, AnyMacro):
             macrolist = macrolist.create_macros()
@@ -863,7 +871,7 @@ def start_macro(
             except KeyboardInterrupt:
                 _progress_print(progress, "[red]KeyboardInterrupt: User aborted[/red]")
             finally:
-                _subprocess_container.stop_all()
+                self._local_subprocess_container.stop_all()
                 if not self.silent:
                     _progress_print(progress, _tasklist_summery(tasklist))
 
@@ -918,6 +926,7 @@ def _worker(self, task, task_queue):
                     debug_mode=self.debug_mode,
                     folder=task.folder,
                     interactive_mode=self.interactive_mode,
+                    subprocess_container=self._local_subprocess_container,
                 )
                 try:
                     task.retcode = execute_anybodycon(**exe_args)
@@ -997,3 +1006,8 @@ def cleanup_logfiles(self, tasklist):
                     silentremove(macrofile)
                 except OSError as e:
                     logger.debug(f"Could not remove: {macrofile} {e}")
+
+    def __del__(self):
+        """Destructor to clean up any remaining subprocesses."""
+        if hasattr(self, "_local_subprocess_container"):
+            self._local_subprocess_container.stop_all()
diff --git a/pixi.lock b/pixi.lock
index f970c13..dfc9995 100644
--- a/pixi.lock
+++ b/pixi.lock
@@ -1548,7 +1548,7 @@ packages:
   timestamp: 1758634638734
 - conda: .
   name: anypytools
-  version: 1.19.2
+  version: 1.20.0
   build: pyh4616a5c_0
   subdir: noarch
   depends:
@@ -1566,7 +1566,7 @@ packages:
   - pywin32
   license: MIT
   input:
-    hash: 7e2d0d0a7d3047761d10a95adebb4c0fcb16d6bf9d24ce308e404018832af082
+    hash: 9fa6ba0badfc0ba8f381d093d418ecf329742d29ac1f91dbaf351feb6402988f
     globs:
     - pyproject.toml
 - conda: https://prefix.dev/conda-forge/win-64/aom-3.9.1-he0c23c2_0.conda
diff --git a/pixi.toml b/pixi.toml
index 9dba32c..56dcb32 100644
--- a/pixi.toml
+++ b/pixi.toml
@@ -10,7 +10,7 @@ anypytools = {path= "."}
 
 [package]
 name = "anypytools"
-version="1.19.2"
+version="1.20.0"
 
 [package.build] 
 backend = { name = "pixi-build-python", version = "*" }