Hello, 
I have an problem that when uploading a new image, the uploaded stays at 100% but no image was uploaded. 
I tried chaning memory_limit and co. to 256M or so but nothing worked either. 
In the error log, there was an out of error warning, caused by core/ImageSizer.php. 
So: I used "Max Image Dimensions" for resizing every image above 1500px to 1500px. 
Here is the thing: 
After disabling this feature, so I don't use max image dimensions feature, everything works. 
How can I enable this feature without breaking everything? 
It seems that it's a bug in ImageSizer.php that can't handle with large files on some server systems? 
I hope for your answers!