Hi, Gordon.
I - and others - have been reporting that problem for at least a couple of years, but it seems nobody cares. At least, nobody who could fix it. We're not sure if it is Intuit's problem or Microsoft's. We've reported it to both of them with no results.
If you can get any action from either of them - or even just a diagnosis - please let us know.
I have the Microsoft Wireless Laser Desktop 6000, including the Microsoft Wireless Laser Mouse 6000, bought directly from the Microsoft Company Store, and Intellipoint 6.2 straight from the net. In MOST software, it works well. But in Intuit produces (Q2008 Deluxe and TurboTax 2007 Deluxe), I get erratic and inconsistent results, as you reported.
During the Vista beta, someone told me about a program (not a driver) called X-Mouse Button Control from Highresolution Enterprises in England. This worked well, but I haven't tried it recently and I don't recall if it solved the Quicken problem, specifically. If you'd like to try it:
formatting link
Please let us all know if it fixes this problem in Quicken.
RC