[libreoffice-users] Calc - Invalid name error - help request

I'm having a struggle with Calc.  I trying to migrate over from Excel 
but have a problem.

When I type [=1+1.5] into a cell, I get "Invalid Name" error.  If I save 
the file as an xlsx and open in Excel it calculates OK and give 2.5.  If 
I then open the xlsx in LO, it still says "Invalid Name".

If I put [=1+1,5], I get ERR: 509. This makes sense since I'm in Canada 
and we use "." to separate decimals.

If I put [=1+1] LO correctly calculates "2" with no error.

I have older LO spreadsheets that calculate OK.  Every new CALC 
spreadsheet has this problem.

I'm not sure how to figure out why I get this error and why LO won't 
calculate such a basic equation.

What should I be looking at?

Mac OSX 10.10.5
LO 5.3.4 & 5.4

I'm on daily digest mode so please cc me when you reply to the list.

Thank you in advance.
B.

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