I installed this button the other day on the current latest DOpus and Windows 7 and it worked just fine.
My question or problem is that I can't make the thumbnail cache larger than 6GB - Which is why I tried moving it off my main SSD system drive - to see if that worked?
It didn't change anything, the maximum size seems to be set at 6GB and when trawling through my photo archives the other day, it was taking ages to rebuild thumbnail archives, with current usage at approx 5.9GB, so all I can guess, is that to make way for new thumbnails, older ones are being deleted, which is a pain next time I want to view other folders again (if they're the ones that got deleted)
Is there any way to increase the 6GB limit? I now have plenty of space for them on my newly assigned (junctioned) spool/cache drive.