Dropbox seems to be stuck in a loop, and opening hundreds of background processes. This consumes all my CPU capacity, then eats at my memory and disk space. See attached pics. There also seem to be windows being automatically opened, as my typing or mouse clicks in other apps is interrupted when the hundreds of background processes are opened. The number seems to level off after about 1650 (about 100 are from other sources; I waited for a few minutes after startup to start the dropbox app, and didn't have too much trouble until I opened other programs that access files on Dropbox).
I went through the file permissions troubleshooting, and it came back with an error about the cookies file. I couldn't find it in order to try to fix it.
\Users\(username)\Cookies\*: Access is denied
Performance Post Dropbox and other apps startup
processes post startup
processes pre-startup
performance pre-startupSuccessfully processed 644 files; Failed processing 1 files