I hate windows but since my husband uses it and Quicken stinks on a mac I am forced to have to deal with a windows computer .
I have installed 1p on a new w8 machine and it did work for several weeks. I noticed today that the 1p browser was still open when I opened chrome and now there was a red badge on the 1p icon. When I tried to open the program as suggested in your troubleshooting page I couldn't even do that "1p has encountered a problem, c:/.......agilekeychain is not a 1p folder. Changing your master password in the Mac version might correct this problem". Why? IT is long and we both have it memorized and my son even has it to get into our 1p if we can't. The trouble shooting report says "could not sync because the 1p database was replace or was recreated. You can fix this by reinstalling the extension" Did that and it didn't work.
I should explain that dropbox is located in my user folder but I don't know if that is a problem when I'm working in his account since it has worked previously.