diff --git a/Code/ReadCTFFile.m b/Code/ReadCTFFile.m
index e03a777..d0c777b 100644
--- a/Code/ReadCTFFile.m
+++ b/Code/ReadCTFFile.m
@@ -74,7 +74,8 @@ function ScanParamsData(FileStr, VarName)
     %   Assumes square cropping
     %   Formula by DTF
     if ~isfield(ScanParams,'PCX') || ~isfield(ScanParams,'PCY') || ~isfield(ScanParams,'VHRatio') || ~isfield(ScanParams,'DD')
-        warndlg({'No Pattern Center data found. PC vals set to zero.';'Run PC Calibration'},'Missing Info in .CPR file');
+        w = warndlg({'No Pattern Center data found. PC vals set to zero.';'Run PC Calibration'},'Missing Info in .CPR file');
+        uiwait(w)
         ScanParams.xstar = 0.1;
         ScanParams.ystar = 0.1;
         ScanParams.zstar = 0.1;