diff --git a/pyproject.toml b/pyproject.toml
index 928bb083408fbf24b26961bd1bff5bb7bc35f681..69c7a1058f2978c986ad1869391539847dd79ef9 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "aliby"
-version = "0.1.54"
+version = "0.1.55"
 description = "Process and analyse live-cell imaging data"
 authors = ["Alan Munoz <alan.munoz@ed.ac.uk>"]
 packages = [
diff --git a/src/agora/io/signal.py b/src/agora/io/signal.py
index c0c3e840f171d8c092ffec03ee4efb0d841f5a92..4ea45539c8a5905e366604ce2c643271ffa00b22 100644
--- a/src/agora/io/signal.py
+++ b/src/agora/io/signal.py
@@ -1,3 +1,4 @@
+import logging
 import typing as t
 from copy import copy
 from functools import cached_property, lru_cache
@@ -85,10 +86,10 @@ class Signal(BridgeH5):
         """Find the interval between time points (minutes)."""
         tinterval_location = "time_settings/timeinterval"
         with h5py.File(self.filename, "r") as f:
-            if tinterval_location in f:
+            if tinterval_location in f.attrs:
                 return f.attrs[tinterval_location][0]
             else:
-                print(
+                logging.getlogger("aliby").warn(
                     f"{str(self.filename).split('/')[-1]}: using default time interval of 5 minutes"
                 )
                 return 5
diff --git a/src/postprocessor/chainer.py b/src/postprocessor/chainer.py
index 831d5471b558cd574410d1b0d538de98838e7403..21693811c4d57dd38c7f5a11c2c0708f66ce423a 100644
--- a/src/postprocessor/chainer.py
+++ b/src/postprocessor/chainer.py
@@ -62,7 +62,7 @@ class Chainer(Signal):
             data = self.common_chains[dataset](**kwargs)
         else:
             # use Signal's get_raw
-            data = self.get_raw(dataset, in_minutes=in_minutes)
+            data = self.get_raw(dataset, in_minutes=in_minutes, lineage=True)
             if chain:
                 data = self.apply_chain(data, chain, **kwargs)
         if retain:
diff --git a/src/postprocessor/grouper.py b/src/postprocessor/grouper.py
index 09bff52e5c22b54f5b6346a17a3d7e1a6cafc0af..6b9fa9ee56a1d77fa24ff3b29299ca352db34466 100644
--- a/src/postprocessor/grouper.py
+++ b/src/postprocessor/grouper.py
@@ -165,8 +165,6 @@ class Grouper(ABC):
     ):
         """Enable different threads for independent chains, particularly useful when aggregating multiple elements."""
         if pool is None:
-            # Alan: why is None changed to 8
-            # pool = 8
             pass
         chainers = chainers or self.chainers
         if pool: