Since updating to Xcode 7.3, Qt Creator has the following problems when selecting "Start Debugging":

• Only the first few lines of the log appear in "Application Output". The number of lines of the log is inconsistent, but is roughly between 3 and 6.
• The debug session does not shut down after the application (in question) quits, and must be manually ended by clicking the red square.

None of these problems occur when selecting "Run", and they worked fine for "Start Debugging" with the prior most recent version of Xcode.