Since I switched to Windows 10, and installed LO Version: 5.1.0.3 text becomes invisible in Calc cells after hitting Enter. Then when I save the file, it appears.
This sounds like the same problem that appeared in this thread:
Now that tread says: Closed for the following reason question is not relevant or outdated by Alex Kemp
close date 2015-10-23 13:43:43.433880