PY2.7: RunPython: Cannot open two workbooks, 0.9

[DougAJ4]

Trying simple examples using callpython, and also the fibbonacci and simulation example files (lite versions) I get:
Traceback (most recent call last):

File "", line 1, in
File "d:\users\douga\documents\spread\xlwings\fibonacci\fibonacci.py", line 28, in xl_fibonacci
sht = xw.Book.caller().sheets[0]
File "C:\Users\douga\Anaconda2\lib\site-packages\xlwings\main.py", line 540, in caller
return cls(impl=app.books.open(fullname).impl)
File "C:\Users\douga\Anaconda2\lib\site-packages\xlwings\main.py", line 2687, in open
"Cannot open two workbooks named '%s', even if they are saved in different locations." % name
ValueError: Cannot open two workbooks named 'fibonacci.xlsm', even if they are saved in different locations.
Python 2.7 64 bit, xlwings Rel 0.9 installed from Anaconda, Excel 2016 32 bit and Windows 10 64 bit