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I'm sorry I don't follow what you mean. You try to explain it a different way.

Ok, next try ;-) : I open a new project in which 19 photos should be in the background. If I load them as grid data, a white surface, instead of the photos appears in about one third. Repeated updating leads only to the fact that other photos turn white, but the photos are never all shown properly. Is it because of the large size of all the photos? The problem seams to be only the display, all 19 photos are shown in the legend...

Angelika Schloesser wrote:

Every orthophto has a size about 45 MB. The selected coordinate reference system is correct.

without a sample of 1 image that do show and 1 that does not it would be hard to tell if is a local issue, a data issue, a crs issue or a qgis issue. If you cannot share this sample then run the "info" tool in the raster menu on two images, ones that show and one that doesn't, and post/check the results. Do the coordinate of origin of the image that does not show make sense?

Angelika Schloesser wrote:

I have run the "info" tool and compared the results from one image, that was once shown, and once not. Information was always same (e.g. in the screenshot attached). In Version 1.8 the problem does not exist and all orthophotos are shown. But I want to draw the maps in the newest version. :-(

please have a look at the "corners coordinates" part of the infos that the show about the two images, the one that will show and the one that don't. The corner coordinates of the image that does not show do make any sense (relatively to the coordinate reference system and the geographic area you are using)?. Thanks.

Not shown image:

Corner Coordinates:
Upper Left ( 72000.000, 82000.000) ( 6d 3'21.03"E, 49d40'17.22"N)
Lower Left ( 72000.000, 81000.000) ( 6d 3'21.11"E, 49d39'44.86"N)
Upper Right ( 73000.000, 82000.000) ( 6d 4'10.90"E, 49d40'17.27"N)
Lower Right ( 73000.000, 81000.000) ( 6d 4'10.97"E, 49d39'44.90"N)
Center ( 72500.000, 81500.000) ( 6d 3'46.00"E, 49d40' 1.06"N)

Ok, here's the problem. Comparing this project with another similar one showed that the data between the second brackets is too much. As coordinate reference system I have chosen Luxembourg 1930 / Gauss. This needs just the information between the first brackets... But how can I change this?

Angelika Schloesser wrote:

Not shown image:

Corner Coordinates:
Upper Left ( 72000.000, 82000.000) ( 6d 3'21.03"E, 49d40'17.22"N)
Lower Left ( 72000.000, 81000.000) ( 6d 3'21.11"E, 49d39'44.86"N)
Upper Right ( 73000.000, 82000.000) ( 6d 4'10.90"E, 49d40'17.27"N)
Lower Right ( 73000.000, 81000.000) ( 6d 4'10.97"E, 49d39'44.90"N)
Center ( 72500.000, 81500.000) ( 6d 3'46.00"E, 49d40' 1.06"N)

Ok, here's the problem. Comparing this project with another similar one showed that the data between the second brackets is too much. As coordinate reference system I have chosen Luxembourg 1930 / Gauss. This needs just the information between the first brackets... But how can I change this?

so this probably means that you should have issues with your data. If the image corner coordinates in degrees does not make sense then the value in meters probably does not correspond to the coordinate reference system you think the images have been given. Anyway this does not seems a qgis issue and to receive further assistance you should attach/link one of the problematic images (along with a good one).