I use the Insert Sheet from File often to bring CSV and TAB delimited files into Calc. After upgrading to LO 6.3.3.2 (Windows 10, 64 bit) this function is not working. After selecting the file to import, the preview screen – which normally shows how the data will line up in Calc – is blank, and the OK button is greyed out. Reverting to LO version 6.2.8 solves this problem.
Out of curiosity, I also tried the LO beta version 6.4.0, and the Insert Sheet from File function fails there, too.
Anyone else experiencing this?