Me sucede algo similar.. Ya desinstale e instale el programa y aún así no lo he podido solucionar. Me sale el siguiente mensaje.
bn.BUILD_KEY: Dropbox bn.VERSION: 215.4.7202 bn.constants.WINDOWS_SHELL_EXT_VERSION: 77 bn.is_frozen: True machine_id: 1f4d7912-91d1-4d36-987d-4df65152d27e pid: 4252 cwd: 'C:\\Program Files (x86)\\Dropbox\\Client' real_path='C:\\Program Files (x86)\\Dropbox\\Client' mode=0o40777 uid=0 gid=0 parent mode=0o40777 uid=0 gid=0 HOME: None appdata: 'C:\\Users\\Emmanuel Ontiveros\\AppData\\Local\\Dropbox\\instance1' real_path='C:\\Users\\Emmanuel Ontiveros\\AppData\\Local\\Dropbox\\instance1' mode=0o40777 uid=0 gid=0 parent mode=0o40777 uid=0 gid=0 dropbox_path: 'C:\\Dropbox' real_path='C:\\Dropbox' mode=0o40777 uid=0 gid=0 parent mode=0o40777 uid=0 gid=0 sys_executable: 'C:\\Program Files (x86)\\Dropbox\\Client\\Dropbox.exe' real_path='C:\\Program Files (x86)\\Dropbox\\Client\\Dropbox.exe' mode=0o100777 uid=0 gid=0 parent mode=0o40777 uid=0 gid=0 trace.__file__: 'C:\\Program Files (x86)\\Dropbox\\Client\\215.4.7202\\python-packages.zip\\dropbox\\client\\ui\\common\\boot_error.pyc' real_path='C:\\Program Files (x86)\\Dropbox\\Client\\215.4.7202\\python-packages.zip\\dropbox\\client\\ui\\common\\boot_error.pyc' not found parent not found TMP: C:\Users\EMMANU~1\AppData\Local\Temp TEMP: C:\Users\EMMANU~1\AppData\Local\Temp tempdir: 'C:\\Users\\EMMANU~1\\AppData\\Local\\Temp' real_path='C:\\Users\\Emmanuel Ontiveros\\AppData\\Local\\Temp' mode=0o40777 uid=0 gid=0 parent mode=0o40777 uid=0 gid=0 Traceback (most recent call last): File "desktop/dropbox/fs_api/lifecycle.py", line 235, in client File "desktop/dropbox/fs_api/lifecycle.py", line 283, in _create_thin_client File "desktop/dropbox/fs_api/fs_api_adapter.py", line 50, in __init__ File "desktop\extensions\fs_api\fs_api_python.pyx", line 63, in fs_api_python.FsApiServer.__cinit__ fs_api_python.FsApiError: "Initializing fs api |>> Initializing application filesystem |>> Attempting to initialize dbx cache directory |>> NtCreateFile syscall: open_unchecked |>> ACCESS_DENIED |>> Permission denied" The above exception was the direct cause of the following exception: Traceback (most recent call last): File "desktop/dropbox/client/main.py", line 964, in wrapper File "desktop/dropbox/client/main.py", line 7160, in finish_dropbox_boot File "desktop/dropbox/client/message_queue.py", line 306, in _wrapped File "desktop/dropbox/client/main.py", line 6604, in _init_components_for_account File "desktop/dropbox/client/main.py", line 6525, in create_sync_engine File "desktop/dropbox/sync_engine_boundary/factory.py", line 212, in make_sync_engine File "desktop/dropbox/sync_engine/nucleus/classic_client/sync_engine.py", line 243, in __init__ File "desktop/dropbox/sync_engine/nucleus/classic_client/modern_client/modern_client.py", line 296, in __init__ File "desktop/dropbox/sync_engine/nucleus/classic_client/modern_client/base.py", line 242, in __init__ File "../win32_x86_64_dropbox_virtual_env/python38/Lib/functools.py", line 967, in __get__ File "desktop/dropbox/fs_api/lifecycle.py", line 259, in client dropbox.fs_api.lifecycle.FsApiClientCreationException: "Initializing fs api |>> Initializing application filesystem |>> Attempting to initialize dbx cache directory |>> NtCreateFile syscall: open_unchecked |>> ACCESS_DENIED |>> Permission denied"