diff --git a/pyproject.toml b/pyproject.toml
index 9d0126a..b8f2d99 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -124,7 +124,7 @@ reportMissingImports = false  # Ignore missing stubs in imported modules
 addopts = """
     --tb=native -vv --strict-markers --doctest-modules
     --doctest-glob="*.rst" --doctest-glob="*.md"
-    --ignore=docs/examples --ignore=src/hextools/profiles
+    --ignore=docs/examples --ignore=src/hextools/profiles --ignore=src/hextools/gui
     """
 # https://iscinumpy.gitlab.io/post/bound-version-constraints/#watch-for-warnings
 filterwarnings = [
diff --git a/src/hextools/photon_delivery_system/dclm.py b/src/hextools/photon_delivery_system/dclm.py
index 09956cd..44fa058 100644
--- a/src/hextools/photon_delivery_system/dclm.py
+++ b/src/hextools/photon_delivery_system/dclm.py
@@ -22,7 +22,7 @@
 from ophyd_async.epics.core import EpicsDevice
 from ophyd_async.epics.motor import Motor as AsyncEpicsMotor
 
-from ..utils import ensure_available
+from ..utils import ensure_available, forward_watcher_updates
 from .shutter import Shutter, ensure_shutter_closed
 
 
diff --git a/src/hextools/profiles/collection.py b/src/hextools/profiles/collection.py
index dc11a61..0fc1a6e 100644
--- a/src/hextools/profiles/collection.py
+++ b/src/hextools/profiles/collection.py
@@ -226,7 +226,19 @@
     sim_z = SimMotor(name="sim_z", instant=False)
 
 
-RE.install_suspender(SuspendFloor(storage_ring.beam_current, 100, resume_thresh=390))
+# Install a suspender to pause the RunEngine if the beam current drops below 100 mA
+# and resume when it rises above 390 mA, unless the ring is in maintenance/shutdown.
+try:
+    _ops_mode = call_in_bluesky_event_loop(storage_ring.operating_mode.get_value())
+except Exception as e:
+    print(f"Could not read storage ring operating mode ({e}); beam suspender not installed.")
+else:
+    if _ops_mode in (NSLS2OpsMode.MAINTENANCE, NSLS2OpsMode.SHUTDOWN):
+        print(f"Storage ring in {_ops_mode.value} mode; beam suspender not installed.")
+    else:
+        RE.install_suspender(
+            SuspendFloor(storage_ring.beam_current, 100, resume_thresh=390)
+        )
 
 # Configure baseline supplemental data to include in the metadata of every run.
 sd = bpp.SupplementalData(
diff --git a/tests/tomography/test_alignment.py b/tests/tomography/test_alignment.py
index 97ba2e3..34b739f 100644
--- a/tests/tomography/test_alignment.py
+++ b/tests/tomography/test_alignment.py
@@ -407,7 +407,15 @@ async def test_tomo_alignment_scan_fails_if_fe_shutter_closed(
     )
 
     with pytest.raises(ValueError, match="Front-end shutter is closed"):
-        RE(tomo_alignment_scan([], rotation_motor, fe_shutter, photon_shutter, 0.1))
+        RE(
+            tomo_alignment_scan(
+                [],
+                0.1,
+                fe_shutter=fe_shutter,
+                photon_shutter=photon_shutter,
+                rot_motor=rotation_motor,
+            )
+        )
 
 
 @pytest.mark.parametrize(
@@ -469,14 +477,14 @@ def msg_hook(msg: Msg):
     runs: RunEngineResult = RE(
         tomo_alignment_scan(
             [ktx1],
-            rotation_motor,
-            fe_shutter,
-            photon_shutter,
             exposure_time,
             num_projections=num_projections,
             init_angle=init_angle,
             stop_angle=stop_angle,
             base_x_offset=base_x_offset,
+            fe_shutter=fe_shutter,
+            photon_shutter=photon_shutter,
+            rot_motor=rotation_motor,
             sample_stage_x=None if not include_sample_stage_x else sample_stage_x,
         ),
         cache_docs,  # type: ignore