IOError: [Errno 13] Permission denied when trying to import and use plotly - windows

Question

I am running a flask application using plotly for some of my charting figures, and it runs fine on my work pc.
I have just tried to run it on my personal pc and on starting the local host server I am getting the following message:
Traceback (most recent call last):
File "controller.py", line 14, in <module>
from plotly.offline import plot
File "C:\Users\StuJ7\Anaconda2\lib\site-packages\plotly\__init__.py", line 31, in <module>
from plotly import (plotly, dashboard_objs, graph_objs, grid_objs, tools,
File "C:\Users\StuJ7\Anaconda2\lib\site-packages\plotly\plotly\__init__.py", line 10, in <module>
from . plotly import (
File "C:\Users\StuJ7\Anaconda2\lib\site-packages\plotly\plotly\plotly.py", line 29, in <module>
from plotly import exceptions, files, session, tools, utils
File "C:\Users\StuJ7\Anaconda2\lib\site-packages\plotly\tools.py", line 403, in <module>
#utils.template_doc(**get_config_file())
File "C:\Users\StuJ7\Anaconda2\lib\site-packages\plotly\tools.py", line 241, in get_config_file
ensure_local_plotly_files() # make sure what's there is OK
File "C:\Users\StuJ7\Anaconda2\lib\site-packages\plotly\tools.py", line 94, in ensure_local_plotly_files
utils.save_json_dict(fn, contents)
File "C:\Users\StuJ7\Anaconda2\lib\site-packages\plotly\utils.py", line 61, in save_json_dict
with open(filename, "w") as f:
IOError: [Errno 13] Permission denied: 'C:\\Users\\StuJ7\\.plotly\\.credentials'
So it's obvious from the error message that it is an issue with permissions regarding the .plotly.credentials file - but I have assigned myself full permissions to the whole .plotly folder through the security settings and I have also pip installed plotly as an administrator.
I've tried extensive Googling , but there doesn't seem to be much windows related advice regarding this particular issue.
Can anyone suggest how I can get this to work.