I have the same issue… This happens when opening raws edited with 5.6 in 5.8.
This is the file browser in 5.8:
In my case, the problem is that white balance is disabled:
Once I enable it, all is well:
@heckflosse Ingo, do you want me to file an issue?
No, 5.6 did not have the enable/disable button for white balance, it was always enabled.
I will see whether I can add a check for old files…
I’ve looked at some old PP3 files; they have these lines:
[Version]
AppVersion=5.5
Version=345…
[White Balance]
Enabled=true
…
I wonder if the Enable line is something you could look for in 5.8.
Ingo,
This is the one in the screenshot.
Note that I have previously processed this exact same CR2 in the old version of RT, without any problems at all. Unfortunately, I don’t remember the version no. of RT that I was using - and that old PC has been scrapped, so I can no longer check.
Miguel,
I already tried the WB on/off button - it doesn’t seem to help me.2012_10_27_0014.CR2 (13.6 MB)
Hm, I wonder if we have different issues, then… they sounded very similar.
I just “processed” this image - this is the WB part of the pp3 file…
[Version]
AppVersion=5.8
Version=346
…
[White Balance]
Enabled=true
Setting=Auto
Temperature=9349
Green=0.11618831722668067
Equal=1
TemperatureBias=0
@bobg This was a bug in 5.8 concerning Canon mraw/sraw pseudo-raw files. It’s already fixed in dev. Just use a nightly build and it will work
I will try to reproduce your issue now…
How do I do that? - I’m just using the Windows10 install file - Should I download the latest version and reinstall…?
Get RawTherapee_dev_5.8-281-gaa389dbca_20200229.exe from here or maybe better wait until tomorrow and get the new one, as there were some performance issues in latest which will be fixed in new one…
OK, I can wait until tomorrow and then get the new version…
Thanks very much for all your help on this.
Was this using 5.8 release or 5.8 dev build?
It was the file RawTherapee_5.8.exe…
From the download page.
I’m using 5.8 release (Arch package).
Ingo,
I’m trying to find more about this issue, and your question reminded me that I tried using 5.8-dev a couple months ago (I wanted to try Capture Sharpening 
). (I’ve been so busy these past few months that I’ve done very little photo processing).
Anyway: it seems like the problem only happens when I use 5.8-release to open raw files with a PP3 generated by 5.8-dev.
I just tried using 5.8-release with some older files, which I’m 99% certain I never opened with 5.8-dev, and I don’t see this problem.
Good to know 
. I won’t try to reproduce then
Sorry… 
I installed RawTherapee_dev_5.8-300-gf4da00158_20200302.exe
and I now have correct thumbnails and editor images! 
(I had to delete all of the old pp3 files)
Thanks again Ingo.
