Created attachment 40673 [details]
Simple 5x2 cell spreadsheet, with a A1:A+inf defined as 'Divisor'

This bug is a range definition on a 64-bit machine when reading from a saved file.  Per conversation with Kohei, it does not occur on a 32-bit machine.

Steps to recreate:
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1. Create new document normally.

2. Define column as some name, say A1:A1048576 as Divisor

3. Enter some numbers in the Divisor column:
 A1: 1
 A2: 2
 A3: 3
 A4: 4
 A5: 5

4. Enter some formula involving the Divisor column in column B:
 B1: =A1/Divisor   (Should display 1 when you hit return)
 B2: =A2/Divisor   (Should display 1 when you hit return)
 B3: =A3/Divisor   (Should display 1 when you hit return)
 B4: =A4/Divisor   (Should display 1 when you hit return)
 B5: =A5/Divisor   (Should display 1 when you hit return)

5. Save the document, say as test.ods

6. Close LibreOffice
7. Reopen LibreOffice, and open test.ods.
  Observe that the B1:B5 all have a #DIV/0! error
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I've attached test.ods in case the above instructions aren't clear.  You should be able to open the document just fine on a 32-bit version of LO, but encounter the error of step 7 on a 64-bit version of LO.

I believe this to be a blocker bug because variable, cell, and range definitions are used heavily in at least the chemistry, physics, and engineering communities in which I dabble.  Having spreadsheets "randomly" stop working is an instant non-starter.