I too am seeing this. I have disabled delayengine as the original bug reporter as done and it is fine now.
This is just an email that I hope will quicken the process for a new version into sarge :) There has recently been a new patch for this, I don't know if you guys have seen http://bugs.proftpd.org/show_bug.cgi?id=2622 Best of luck and look forward to seeing a fix for it :) Keep up the good work. Thanks Tim Warnock ISP Technical Manager GetOnIt! Nationwide Internet. 1300 88 00 97 timoid (at) getonit.net.au