diff --git a/mmgen/addr.py b/mmgen/addr.py
index f9f3245c..c760e876 100755
--- a/mmgen/addr.py
+++ b/mmgen/addr.py
@@ -117,10 +117,10 @@ class AddrListID(HiliteStr, InitErrors, MMGenObject):
 			me.mmtype = mmtype
 			return me
 		except Exception as e:
-			return cls.init_fail(e, f'sid={sid}, mmtype={mmtype}')
+			return cls.init_fail(e, f'sid={sid}, mmtype={mmtype}, id_str={id_str}')
 
 def is_addrlist_id(proto, s):
-	return get_obj(AddrListID, proto=proto, id_str=s, silent=False, return_bool=True)
+	return get_obj(AddrListID, proto=proto, id_str=s, silent=True, return_bool=True)
 
 class MMGenID(HiliteStr, InitErrors, MMGenObject):
 	color = 'orange'
diff --git a/mmgen/proto/btc/tx/new_swap.py b/mmgen/proto/btc/tx/new_swap.py
index 5a8ca6c3..8e62b92b 100755
--- a/mmgen/proto/btc/tx/new_swap.py
+++ b/mmgen/proto/btc/tx/new_swap.py
@@ -20,8 +20,4 @@ class NewSwap(New, TxNewSwap):
 
 	async def process_swap_cmdline_args(self, cmd_args):
 		import sys
-		from ....util import msg
-		msg(' '.join(cmd_args))
 		sys.exit(0)
-		raise NotImplementedError('Work in Progress!')
-		return cmd_args
diff --git a/mmgen/tx/base.py b/mmgen/tx/base.py
index 8dd3f560..c6998e10 100755
--- a/mmgen/tx/base.py
+++ b/mmgen/tx/base.py
@@ -79,6 +79,7 @@ class Base(MMGenObject):
 	locktime     = None
 	chain        = None
 	signed       = False
+	file_format  = 'json'
 	non_mmgen_inputs_msg = f"""
 		This transaction includes inputs with non-{gc.proj_name} addresses.  When
 		signing the transaction, private keys for the addresses listed below must
@@ -89,7 +90,6 @@ class Base(MMGenObject):
 		Non-{gc.proj_name} addresses found in inputs:
 		    {{}}
 	"""
-	file_format = 'json'
 
 	class Input(MMGenTxIO):
 		scriptPubKey  = ListItemAttr(HexStr)
diff --git a/mmgen/tx/new.py b/mmgen/tx/new.py
index 3a14eff6..f396760e 100755
--- a/mmgen/tx/new.py
+++ b/mmgen/tx/new.py
@@ -249,6 +249,7 @@ class New(Base):
 			die(2, 'At least one output must be specified on the command line')
 
 		self.add_mmaddrs_to_outputs(ad_f, ad_w)
+
 		self.check_dup_addrs('outputs')
 
 		if self.chg_output is not None:
diff --git a/test/cmdtest_d/ct_autosign.py b/test/cmdtest_d/ct_autosign.py
index c3970c6c..d80a1a63 100755
--- a/test/cmdtest_d/ct_autosign.py
+++ b/test/cmdtest_d/ct_autosign.py
@@ -458,16 +458,7 @@ class CmdTestAutosignThreaded(CmdTestAutosignBase):
 		return 'silent'
 
 	def wait_loop_kill(self):
-		self.spawn('', msg_only=True)
-		pid = int(self.read_from_tmpfile('autosign_thread_pid'))
-		self.delete_tmpfile('autosign_thread_pid')
-		from signal import SIGTERM
-		imsg(purple(f'Killing autosign wait loop [PID {pid}]'))
-		try:
-			os.kill(pid, SIGTERM)
-		except:
-			imsg(yellow(f'{pid}: no such process'))
-		return 'ok'
+		return self._kill_process_from_pid_file('autosign_thread_pid', 'autosign wait loop')
 
 	def _wait_signed(self, desc):
 		oqmsg_r(gray(f'→ offline wallet{"s" if desc.endswith("s") else ""} waiting for {desc}'))
diff --git a/test/cmdtest_d/ct_base.py b/test/cmdtest_d/ct_base.py
index 39d68bdd..1ac0a920 100755
--- a/test/cmdtest_d/ct_base.py
+++ b/test/cmdtest_d/ct_base.py
@@ -23,9 +23,9 @@ test.cmdtest_d.ct_base: Base class for the cmdtest.py test suite
 import sys, os
 
 from mmgen.util import msg
-from mmgen.color import gray
+from mmgen.color import gray, purple, yellow
 
-from ..include.common import cfg, write_to_file, read_from_file
+from ..include.common import cfg, write_to_file, read_from_file, imsg
 from .common import get_file_with_ext
 
 class CmdTestBase:
@@ -122,3 +122,15 @@ class CmdTestBase:
 
 	def _cashaddr_opt(self, val):
 		return [f'--cashaddr={val}'] if self.proto.coin == 'BCH' else []
+
+	def _kill_process_from_pid_file(self, fn, desc):
+		self.spawn('', msg_only=True)
+		pid = int(self.read_from_tmpfile(fn))
+		self.delete_tmpfile(fn)
+		from signal import SIGTERM
+		imsg(purple(f'Killing {desc} [PID {pid}]'))
+		try:
+			os.kill(pid, SIGTERM)
+		except:
+			imsg(yellow(f'{pid}: no such process'))
+		return 'ok'
diff --git a/test/cmdtest_d/ct_regtest.py b/test/cmdtest_d/ct_regtest.py
index efeb7789..9cd88a83 100755
--- a/test/cmdtest_d/ct_regtest.py
+++ b/test/cmdtest_d/ct_regtest.py
@@ -1140,7 +1140,7 @@ class CmdTestRegtest(CmdTestBase, CmdTestShared):
 	def bob_send_non_mmgen(self):
 		keyfile = joinpath(self.tmpdir, 'non-mmgen.keys')
 		atype = 'S' if self.proto.cap('segwit') else 'L'
-		outputs_cl = self._create_tx_outputs('alice', ((atype, 2, ', 10'), (atype, 3, '')))
+		outputs_cl = self._create_tx_outputs('alice', ((atype, 2, ',10'), (atype, 3, '')))
 		return self.user_txdo(
 			user         = 'bob',
 			fee          = rtFee[3],