Thanks Eileen, but I did not try that, however, I did solve the problem.
The problem was in Audacity. I did upgrade to the latest version and when I opened my clip with the new version I discovered that the project rate was still set at 48000 hz even though I was saving it at 44100 hz. I changed the project rate to 44100 hz and saved it again and waa laa it works!
Thanks to all.
Paul