Always up for a try-out
This a Win10 (VM) / Gimp 2.10.32 / Rawtherapee 5.8
My two euros worth.
Does RawTherapee (RT) on its own open the type of RAW image file you are using ?
If it does, can you send it manually to Gimp. In RT preferences (1) is the path to Gimp correct ?
Does the 'Edit Current Image in External Editor' (2) icon open Gimp and load the image ? This can be very slow.
Attachment:
01-rt.jpg [ 120.64 KiB | Viewed 1508 times ]
In Gimp Edit -> Preferences -> Image Import & Export Is the Raw Image Importer for RT showing ? If there is more that one plugin showing, click on it then OK to make it active. Restart Gimp.
Try opening a RAW image in Gimp -> Sends to RT -> Close RT -> Sends back to Gimp. This is very slow.
Attachment:
02-gimp.jpg [ 87.22 KiB | Viewed 1508 times ]
(mild rant: Why the Gimp devs have gone this route I cannot understand. I still use a nufraw gimp plugin which opens my old .rw2 images quickly for editing in Gimp. A shame it is not updated)
Otherwise I do not know ? Sometimes loading an image from a external drive is blocked. A Window security issue ?