I have made an AnyDVD beta release. Everybody who has problems (and those who don't as well) can try it out:

http://sandbox.slysoft.com/SetupAnyDVD6089.exe

The "Aggressive I/O Mode" is now very different from what it has been before, and should hopefully satisfy everybody. It should behave like 6.0.8.2 with the additional features of 6.0.8.5/ 6.0.8.8 (New Dell computers / SATA / RAID users can use 1-click & Co., full 64-bit support, better Vista support, ...)
(Alan, this should answer the question why the I/O code was changed in the first place )

It would be very good to know, if all applications requiring "Aggressive I/O" work fine and see decrypted discs (InterVideo DVDCopy, 1-click DVD copy... someone still using 321-Studios DVDXCopy?)

Here is the complete changelog:

6.0.8.9 2006 11 28
- New: Runs under VirtualPC on PowerPC MACs
- Change: "Aggressive I/O Mode" is less "aggressive", hopefully fixes problems
some users are having
- Change: Clicking "Default" no longer resets "Aggressive I/O Mode" setting
- Fix: DEP error on Windows Vista