In the course of routine spreadsheet maintenance I delete unused
columns and rows to reset the lower right corner of the spreadsheet,
in an attempt to optimize use of spreadsheet resources and reduce file
size.

In one tab of a particular workbook, when I delete unused columns
their column width resets to zero, hiding them. It only happens in
that one tab: other tabs in the same workbook behave normally.

Don't know if this is a relevant data point: I sent this file to
Europe for use by colleagues there, and some formulas came back
translated into another language (EDATE became EDATUM, for instance).

Anyone seen this before?

Thanks,
Dave O
Eschew obfuscation