diff --git a/.circleci/config.yml b/.circleci/config.yml
index 984216f..a3aded6 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -106,6 +106,32 @@ jobs:
           root: images
           paths:
             - "*"
+  build-release:
+    docker:
+      - image: docker:stable-git
+    steps:
+      - checkout
+      - setup_remote_docker
+      - run:
+          name: Install dependencies
+          command: |
+            apk add --no-cache \
+              python-dev py-pip bash pigz build-base libffi-dev openssl-dev
+            pip install \
+              docker-compose awscli
+      - run:
+          name: Build docker image
+          command: |
+            mkdir images
+            echo "export TAG=$CIRCLE_TAG" >> images/env.sh
+            source images/env.sh
+            docker build --rm --force-rm -t isce/isce2:$TAG -f docker/Dockerfile .
+            cd images
+            docker save isce/isce2:$TAG > isce2.tar
+      - persist_to_workspace:
+          root: images
+          paths:
+            - "*"
   build-periodically:
     docker:
       - image: docker:stable-git
@@ -172,6 +198,22 @@ workflows:
           filters:
             branches:
               only: master
+  build-deploy-release:
+    jobs:
+      - build-release:
+          filters:
+            tags:
+              only: /^v.*/
+            branches:
+              ignore: /.*/
+      - deploy:
+          requires:
+            - build-release
+          filters:
+            tags:
+              only: /^v.*/
+            branches:
+              ignore: /.*/
   weekly:
     triggers:
       - schedule:
diff --git a/components/isceobj/Sensor/UAVSAR_HDF5_SLC.py b/components/isceobj/Sensor/UAVSAR_HDF5_SLC.py
index 6323f5b..ffac857 100755
--- a/components/isceobj/Sensor/UAVSAR_HDF5_SLC.py
+++ b/components/isceobj/Sensor/UAVSAR_HDF5_SLC.py
@@ -188,7 +188,10 @@ class UAVSAR_HDF5_SLC(Sensor):
 
         referenceUTC = file['/science/LSAR/SLC/swaths/zeroDopplerTime'].attrs['units'].decode('utf-8')
         referenceUTC = referenceUTC.replace('seconds since ','')
-        referenceUTC = datetime.datetime.strptime(referenceUTC,'%Y-%m-%d %H:%M:%S')
+        format_str = '%Y-%m-%d %H:%M:%S'
+        if '.' in referenceUTC:
+            format_str += '.%f'
+        referenceUTC = datetime.datetime.strptime(referenceUTC, format_str)
 
         relStart = file['/science/LSAR/SLC/swaths/zeroDopplerTime'][0]
         relEnd = file['/science/LSAR/SLC/swaths/zeroDopplerTime'][-1]
@@ -222,7 +225,10 @@ class UAVSAR_HDF5_SLC(Sensor):
 
         referenceUTC = file['/science/LSAR/SLC/swaths/zeroDopplerTime'].attrs['units'].decode('utf-8')
         referenceUTC = referenceUTC.replace('seconds since ','')
-        t0 = datetime.datetime.strptime(referenceUTC,'%Y-%m-%d %H:%M:%S')
+        format_str = '%Y-%m-%d %H:%M:%S'
+        if '.' in referenceUTC:
+            format_str += '.%f'
+        t0 = datetime.datetime.strptime(referenceUTC, format_str)
         t = file['/science/LSAR/SLC/metadata/orbit/time']
         position = file['/science/LSAR/SLC/metadata/orbit/position']
         velocity = file['/science/LSAR/SLC/metadata/orbit/velocity']
@@ -247,9 +253,11 @@ class UAVSAR_HDF5_SLC(Sensor):
         ds = fid['/science/LSAR/SLC/swaths/' + self.frequency + '/' + self.polarization]
         nLines = ds.shape[0]
 
-        with open(self.output, 'wb') as fout:
-            for ii in range(nLines):
-                ds[ii,:].astype(np.complex64).tofile(fout)
+        # force casting to complex64
+        with ds.astype(np.complex64):
+            with open(self.output, 'wb') as fout:
+                for ii in range(nLines):
+                    ds[ii, :].tofile(fout)
 
         fid.close()
   
diff --git a/components/isceobj/TopsProc/Factories.py b/components/isceobj/TopsProc/Factories.py
index 744bc91..2e1b22a 100644
--- a/components/isceobj/TopsProc/Factories.py
+++ b/components/isceobj/TopsProc/Factories.py
@@ -50,7 +50,7 @@ def createUnwrapper(other, do_unwrap = None, unwrapperName = None,
     elif unwrapperName.lower() == 'snaphu':
         from .runUnwrapSnaphu import runUnwrap
     elif unwrapperName.lower() == 'snaphu_mcf':
-        from .runUnwrapSnaphu import runUnwrap
+        from .runUnwrapSnaphu import runUnwrapMcf as runUnwrap
     elif unwrapperName.lower() == 'downsample_snaphu':
         from .run_downsample_unwrapper import runUnwrap
     elif unwrapperName.lower() == 'icu':