Fits files opening as grey scale in Pixinsight

[Thomo47]

For the last week all my old lights subs are opening in Pixinsight as greyscale 1:1 yet previously as RGB filename_!<new>. This stops me reprocessing old lights in Pix. Has anyone had this problem in the past and how was it corrected?

[Atmos]

What file format are they?

[LewisM]

In PI: Process - <All Processes> - ConvertToRGBColor

[Atmos]

Probably means they need to be debayered.