A long established, unedited .xlsm file has suddenly started to crash with various runtime errors. This file was originally put together ten years ago as an .xls file and was converted to .xlsm when I upgraded to the newest version of Excel two years ago. It has run flawlessly up till now. It is not a file corruption issue as .xlsm backups going back months and years also crash but older .xls file backups run fine in compatibility mode. If I convert one of those older .xls backups to .xlsm format they too crash. Concluding it was a corrupt application issue I reloaded Office from the website but the problem persists. I have been able to transfer the data from the most recent .xlsm file into the .xls format and it runs fine in compatibility mode but that does not resolve the issue. McAfee virus scan turns up nothing amiss.
The runtime errors occur when data are either added or deleted. Macros run fine.
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