I have a onedrive problem, but not a dropbox one.
After I tried to install onedrive, parts of Maxim DL did not sync, so I uninstalled onedrive.
Now, ACP's All-Sky plate solve does not work. ACP blames a possible poor internet connection, which is possible. except that ACP worked fine with All-Sky plate solving until I tried to used onedrive.

I have just recently installed the latest version of Maxim DL. Could that be a factor?