I am using Window 7 Pro 64-bit. I discover this bug accidentally, not very regular to me. I used a 3RX4c cell in a new spread sheet, located at D3:F6, with some text format, basically bold larger font, red font...etc. So I use "FormatPaintBrush" to copy format, but I lazily clicked the top left of the sheet... and Calc freezes.... Same operation on MS excel seems fine... I think this is an algorithm issue.... Clac go into some sort of endless-loop for the whole sheet....... Anyway, Just let the community know my findings.
It's an old issue. Thanks for reporting your finding *** This bug has been marked as a duplicate of bug 33435 ***