We modifed some code in Nov, 2005 that may be interfering with DirectRT's ability to read the min-max values. For more info, see:
www.empirisoft.com/support/showthread.php?t=42
Do you happen to have version somewhere between 2006.1.12 and 2006.1.15? If so, this is very likely the problem and it is now fixed in the currently posted install package or you can just replace the single file:
c:\directrt\executedrt.exe
with this updated version--just download it, unzip it and use it to replace the older version:
[editors note: the following updated link allows you to download the final release of v2006. For more recent versions, see http://www.empirisoft.com/download.aspx]
http://empirisoft.com/download/drt2006/drt2006.2.28.exe
If you get a chance to try that, please let me know how it goes in terms of helping to resolve the min-max related timing issues.
Best,
Blair