Hi, me again. I found it:
Ctl E or
LIGHTTABLE, menu on right, choose EXPORT SELECTED
This is jpeg, and the image worked on, once exported, is half or less the size of the original jpeg. Not sure if this is normal (95% quality, 8 bit)
I suppose you mean the stripes? The white blocks are drawn in manually I guess?
What did you set as the max size in the export module? Try 0×0.
Yep, yellow stripes. White block are made by me. On some NEF files I have badly mask… And I dont know why…
Do you have OpenCL enabled? Maybe try disabling it in the preferences and see if that fixes it. Oh, and what version of Windows are you using?
That’s very strange. Please file a bug report on https://darktable.org/redmine/projects/darktable/issues/new/ and attach the XMP and (if possible) a raw file that shows that bug.
Or at least specify the camera make/model
I just installed dark table on w10. I had initially the error reported earlier on (does not work if installed in program file folder). Uninstalled and re installed at the root of my C disk.
It worked fine, no crash and I was happy to see that my Canon 80D raw files were recognized.
I tested the program on some raw + xmp files previously edited under Lightroom 6 and I was happy to see that my history was recognized.
Just two bugs to report : the star notes are recognized as well as the color labels. However one file with a rejejected status was not detected as such by the filter.
All my files do have GPS coordinates and I was happy to see that my pictures were placed on the map.
There seems to be a bug here also : pictiures coded within France seem ok. However pictures out of France are not. One picture taken at Lisbon showed up on the map at Corsica. Another picture taken at Cap Vert was placed on Egypt.The bug seems to affect the longitude, latitude seems ok.
Best regards and thanks for having made dark table available to windows users
csierra 02
Do you have an example image?
I looked closer at the bug and now understand why it happens.
The longitude of Lisbon is 9° W and DT has imported it as 9° E
We would need such an image to test and reproduce.
What do you need ? xmp file or raw + xmp ?
The raw is quite heavy…do you have a site where I can upload it ?
As the geolocation seems to be included in your raw file (I hope you didn’t break it while adding that info!) we will need the raw file.
Actually there are some cameras that have a GPS sensor and capture the
geolicalisation data in the file. My Canon 80D does not have this feature
so the gps data have been added after by a software and must be in the xmp
file. The Raw file is not modified after the shot. But I can send you the
raw as well, it is heavy, about 25 MB.
No I did not breake anything ;-), I am doing my tests on a copy of the raw
files 
In that case the XMP would be enough. Just make sure it’s the version as output by your GPS tagging application without having darktable touch it.
That XMP has the coordinates 38,41.8671666667N / 9,12.372W which are also read in darktable for me. I can’t confirm any error there.
Perheps it is a problem with the language settings. Or a combination of the raw image and the xmp. Perhaps you can upload the raw file too.
Can I change the langage settings after the installaltion or do I need to un install and install an english language copy ?
If the issue is with the langage settings there is a bug in Darktable with the French version.
I don’t think the raw file is the problem as other files present the issue too… Cap Vert longitude becomes Egyptian longitude…
I tried to uploaded the raw file but got an error… the file must be to big.