In some cases when cells are merged the cell borders are not correctly imported.
Filter Selection dialog appears on the screen.
Workaround: Open the file with Excel and save it as a new document.
Implement a GoalSeek functionality.
Sometimes leading minus sign in a cell with text is treated as a formula.
A possible workaround is to remove the minus sign or to replace it with some other symbol.
When there are unclosed quotes (") several cells/rows are imported as one.
A possible workaround is to replace all the quote (") symbols with single quote (') symbols.