Thank you for your positive feedback and your patience. I apologize for any inconvenience caused by the colour issue, and I am pleased to hear that reinstalling the extension resolved the problem for you.

Version 1.60 introduced the dark theme, this is probably what you were seeing. The theme can be changed in the display settings (default is "system").
At this same place, you can choose the sub-range of colours to be used. It is not very intuitive: you have to click first on the first colour of the sub-range and then on the last colour of the sub-range (click on the first cell and then on the last one to retrieve the default settings).
Thank you for using Multi Find!