fix grouping functionality

backend/nodes/helpers.py

@@ -180,6 +180,20 @@ def _render_annotation_text(text: str, size_px: int, color: tuple[int, int, int]
         return text_image
 
 
+def _import_ibw_loader():
+    """Import igor's binary wave loader with NumPy 2 compatibility."""
+    if not hasattr(np, "complex"):
+        # igor 0.3 still references np.complex at import time.
+        setattr(np, "complex", complex)
+
+    try:
+        from igor.binarywave import load as load_ibw
+    except ImportError:
+        raise ImportError("Install 'igor' package to load .ibw files: pip install igor")
+
+    return load_ibw
+
+
 # ---------------------------------------------------------------------------
 # Markup helpers  (from display.py — used by Markup)
 # ---------------------------------------------------------------------------
@@ -508,7 +522,7 @@ def list_channels(filepath: str) -> list[dict]:
 
     if ext == ".ibw":
         try:
-            from igor.binarywave import load as load_ibw
+            load_ibw = _import_ibw_loader()
             wave = load_ibw(str(path))
             raw = wave["wave"]["wData"]
             labels = wave["wave"].get("labels", None)

backend/nodes/image.py

@@ -5,7 +5,7 @@ from pathlib import Path
 
 from backend.node_registry import register_node
 from backend.data_types import COLORMAPS, DataField, resolve_colormap_input
-from backend.nodes.helpers import _resolve_path, _SPM_EXTENSIONS
+from backend.nodes.helpers import _resolve_path, _SPM_EXTENSIONS, _import_ibw_loader
 
 
 @register_node(display_name="Image")
@@ -149,11 +149,7 @@ class Image:
 
     @staticmethod
     def _load_ibw_all(path: Path) -> list[DataField]:
-        try:
-            from igor.binarywave import load as load_ibw
-        except ImportError:
-            raise ImportError("Install 'igor' package to load .ibw files: pip install igor")
-
+        load_ibw = _import_ibw_loader()
         wave = load_ibw(str(path))
         wdata = wave["wave"]
         header = wdata["wave_header"]