diff --git a/src/exo/rewrite/new_eff.py b/src/exo/rewrite/new_eff.py
index cf8c5d73..df3a82c5 100644
--- a/src/exo/rewrite/new_eff.py
+++ b/src/exo/rewrite/new_eff.py
@@ -1100,27 +1100,6 @@ def change(x_old, x_new):
 # Extraction of Effects from programs
 
 
-def window_effs(e):
-    eff_access = []
-    syms = {}
-    for i, w in enumerate(e.idx):
-        if isinstance(w, LoopIR.Interval):
-            syms[i] = Sym(f"EXO_EFFECTS_WINDOW_TEMP_INDEX_{i}")
-            eff_access.append(lift_e(syms[i]))
-        else:
-            eff_access.append(lift_e(w.pt))
-
-    eff = [E.Read(e.name, [idx for idx in eff_access])]
-
-    for i, w in enumerate(e.idx):
-        if isinstance(w, LoopIR.Interval):
-            sym = syms[i]
-            bds = AAnd(lift_e(w.lo) <= AInt(sym), AInt(sym) < lift_e(w.hi))
-            eff = E.Loop(syms[i][E.Guard(bds, eff)])
-
-    return eff
-
-
 def expr_effs(e):
     if isinstance(e, LoopIR.Read):
         if e.type.is_numeric():
@@ -1620,10 +1599,10 @@ def Check_ReorderStmts(proc, s1, s2):
     slv.push()
     slv.assume(AMay(p))
 
-    a1 = stmts_effs([s1])
-    a2 = stmts_effs([s2])
+    a1 = G(stmts_effs([s1]))
+    a2 = G(stmts_effs([s2]))
 
-    pred = G(AAnd(Commutes(a1, a2), AllocCommutes(a1, a2)))
+    pred = AAnd(Commutes(a1, a2), AllocCommutes(a1, a2))
     is_ok = slv.verify(pred)
     slv.pop()
     if not is_ok:
@@ -1662,8 +1641,8 @@ def Check_ReorderLoops(proc, s):
         + expr_effs(y_loop.lo)
         + expr_effs(y_loop.hi)
     )
-    a = stmts_effs(body)
-    a2 = stmts_effs(body2)
+    a = G(stmts_effs(body))
+    a2 = G(stmts_effs(body2))
 
     def bds(x, lo, hi):
         return AAnd(lift_e(lo) <= AInt(x), AInt(x) < lift_e(hi))
@@ -1694,8 +1673,7 @@ def bds(x, lo, hi):
         ),
     )
 
-    pred = G(reorder_is_safe)
-    is_ok = slv.verify(pred)
+    is_ok = slv.verify(reorder_is_safe)
     slv.pop()
     if not is_ok:
         raise SchedulingError(f"Loops {x} and {y} at {s.srcinfo} cannot be reordered.")
@@ -1729,8 +1707,8 @@ def Check_ParallelizeLoop(proc, s):
     body2 = SubstArgs(body, subenv).result()
 
     a_bd = expr_effs(s.lo) + expr_effs(s.hi)
-    a = stmts_effs(body)
-    a2 = stmts_effs(body2)
+    a = G(stmts_effs(body))
+    a2 = G(stmts_effs(body2))
 
     def bds(x, lo, hi):
         return AAnd(lift_e(lo) <= AInt(x), AInt(x) < lift_e(hi))
@@ -1747,7 +1725,7 @@ def bds(x, lo, hi):
         ),
     )
 
-    pred = G(AAnd(no_bound_change, bodies_commute))
+    pred = AAnd(no_bound_change, bodies_commute)
     is_ok = slv.verify(pred)
     slv.pop()
     if not is_ok:
@@ -1792,9 +1770,9 @@ def Check_FissionLoop(proc, loop, stmts1, stmts2, no_loop_var_1=False):
     # print(Gloop)
 
     a_bd = expr_effs(lo) + expr_effs(hi)
-    a1 = stmts_effs(stmts1)
-    a1_j = stmts_effs(stmts1_j)
-    a2 = stmts_effs(stmts2)
+    a1 = G(stmts_effs(stmts1))
+    a1_j = G(stmts_effs(stmts1_j))
+    a2 = G(stmts_effs(stmts2))
 
     def bds(x, lo, hi):
         return AAnd(lift_e(lo) <= AInt(x), AInt(x) < lift_e(hi))
@@ -1817,7 +1795,7 @@ def bds(x, lo, hi):
         ),
     )
 
-    pred = filter_reals(G(AAnd(no_bound_change, stmts_commute)), chgG)
+    pred = filter_reals(AAnd(no_bound_change, stmts_commute), chgG)
     # pred    = G(AAnd(no_bound_change, stmts_commute))
     is_ok = slv.verify(pred)
     slv.pop()
diff --git a/tests/test_schedules.py b/tests/test_schedules.py
index f8be4728..a7a8bfa5 100644
--- a/tests/test_schedules.py
+++ b/tests/test_schedules.py
@@ -4716,3 +4716,27 @@ def bar(n: size, A: i8[n]):
 
     bar = autolift_alloc(bar, "tmp_a : _", keep_dims=True)
     assert str(bar) == golden
+
+
+def test_fission_window1():
+    @proc
+    def foo(t: f32[3]):
+        tw = t[:]
+        x: f32[3]
+        for i in seq(0, 2):
+            t[i] = 1.0
+            x[i] = tw[i + 1]
+
+    with pytest.raises(SchedulingError, match="Cannot fission loop"):
+        fission(foo, foo.find("t[_] = 1.0").after())
+
+
+def test_reorder_stmts_window1():
+    @proc
+    def foo(t: f32[3]):
+        tw = t[:]
+        t[0] = 1.0
+        tw[0] = 3.0
+
+    with pytest.raises(SchedulingError, match="do not commute"):
+        reorder_stmts(foo, foo.find("t[_] = 1.0").expand(0, 1))