Trying again with 2.19 .
a curious thing. when I first clicked defrag after re-installing 2.19 it appeared to start doing a defrag as normal; however after clicking stop, and then clicking defrag again then we just 'got building file list' followed almost immediately by 'calculating disk performance'.
unticking 'custom fragmentation settings' and then clicking defrag it started to work - again after clicking stop and then defrag the problem reappeared.
re-ticking the 'custom fragmentation settings' still left the problem.
unticking the 'move files to end of drive' and clicking defrag then it worked, and after clicking stop followed by defrag then it continued to work.
then tried using the 'portable' version - this behaved exactly as above.
so at present it looks as if you can't use 'move files to end of drive' with 2.19 on more than the first instance.
