Folder Tree vanishing in Labrary pane.

[Mike Swift]

I've just had an SSD drive fitted with a clean install of Windows 10 64 bit and was advised to clean install Mezzmo rather than port across.

When I click on a folder in the Library pane parts of the folder tree vanish, it re-appears when I click at the top where Library should be.

I've checked my Video drivers and they are up to date.

Any ideas, photo attached.