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I have a strange behavior that I can reproduce myself like this:

1. I open an existing calc document with two sheets
2. On a new sheet I type something in a cell
3. I change the font to "FreeSans"

After that I see the following behavior:

1. I am not able to enter something in the new sheet
2. I can change the sheets, but they are mixed up (i.e. the first sheet now shows the content of the second sheet)

I cannot really work (except I do not change font at all). What can I do to fix this problem?

Libre Office 5.1.6.2, Ubuntu 16.04.5