Libre Office 5.0.2.2, system Win 10 Pro 64 bits: Math module: Not working formula's cursor option. It is possible to insert the text cursor to the frame of formula and edit him. But insert symbols is not possible in this area. Writer: Language Tools extension ver. 3.0 and 3.1 not working. Version 2.3 is ok. Versions 3.0 and 3.1 working correctly with Apache OpenOffice 4.1.1. These problems do not exist in Windows 10 Pro 32 bits.
Never cramp together two (or more) unrelated issues in a single bug report.