Before no-log

src/main/java/com/elphel/imagej/cuas/CuasMotion.java

@@ -406,7 +406,7 @@ public class CuasMotion {
 				is_lwir,
 				clt_parameters.getScaleStrength(is_aux), // maybe something else
 				gpuQuad);
-		if (clt_parameters.imp.cuas_sky_path != null) {
+		if ((clt_parameters.imp.cuas_sky_path != null) && (clt_parameters.imp.cuas_sky_path.length() >0)) {
 			ImagePlus imp_mask = new ImagePlus(clt_parameters.imp.cuas_sky_path);
 			if (imp_mask.getWidth() == 0) {
 				System.out.println("CuasMotion(): Failed to read sky mask from "+clt_parameters.imp.cuas_sky_path+", not using mask.");

src/main/java/com/elphel/imagej/tileprocessor/TwoQuadCLT.java

@@ -9021,7 +9021,7 @@ if (debugLevel > -100) return true; // temporarily !
 						index_scenes[0], // QuadCLT master_CLT,
 						ref_index);      // int     ref_index)
 				
-				boolean stop_now = sync_command.stopNow(true); // boolean convenient)
+				boolean stop_now = sync_command.stopNow(false); // true); // boolean convenient)
 				if (stop_now) {
 					break; // will still generate videos
 				}