uiputfile error using R2013a on Windows 7

When my code skips the function that creates the GUI:

[FILENAME_TXT,PATHNAME_TXT] = uiputfile('.txt', 'Select location and title of text file.');

and outputs

FILENAME_TXT = 0 PATHNAME_TXT = 0

This error did not occur using earlier versions of MATLAB on Windows XP.

Thank you for any assistance with this issue.

[Walter Roberson]

That is expected if the uiputfile() is canceled.

[Brian]

Sorry about the delayed reply. I was able to get the program to work randomly after repeated tries or by editing the code for FILENAME_TXT to the file name and PATHNAME_TXT to the path name. I never even had the opportunity to click the Cancel button, since the GUI never appeared.