Double clicking on a chart in calc starts a new text box instead of openning the chart for editing. Using a chart of data for a sheet in calc created in LO7.5.5 A single click selcts the chart as expected. Double click from unselected, a text box opens in the middle of the chart. It is not possible to edit the chart in any way. Remedies tried: Repair of installlation. Starting in Safe Mode. Neither helped.
Reinstalled LO7.5.5 and problem remained. Went back to an old backup of the file and problem not there. RESULT - File had become corrupted recently, affecting chart components of the calc .ods file.