I have to agree with Ken. I¡¯ve been working on the same problem on one particular laptop for over 5 years without resolving it. I have 3 computers, one desktop and two laptops, one new and one 10 years old, all Dells. All three are running up to date Windows 10, and the same version of DecoderPro (4.18) and Java. All 3 have Norton antivirus and all 3 are set to allow DP through the firewall. All 3 have Photoshop and other image editing software on them since that used to be a fair portion of my job, and my wife is a graphic artist. The images are on a shared OneDrive Folder where I have all of the JMRI user files. The images are all .jpg set to 500 pixel width and a 300 PPI resolution. The file sizes vary from about 250kb to 500kb. They originally came from a variety of sources, including ones that I took, ones downloaded from railfan sites, and on-line images from vendor sites. The original image formats were .jpg, .png, and the occasional .gif.
The drag and drop works fine on the desktop and the newer laptop. The older laptop has always shown the red slash circle with all images, including a birthday cake picture I took. It doesn¡¯t matter whether the images are in OneDrive, a local folder, a flash drive, or directly from the camera. However, any of the images can be opened, viewed, and edited on that laptop with any of the photo editing software. It is only DP on that machine that won¡¯t allow them to be dragged in. One thing of interest is that if on that laptop I edited an engines information in the roster.xml file to include the link to the image, it would show up on the roster entry without a problem.?
So after 5 years of fiddling with this I have declared myself officially stumped. I like having the image of the loco on the throttle so I use the desktop PC to drag the images into the Media boxes, so that¡¯s what I use, and the laptops for programming. I don¡¯t think it¡¯s a JMRI problem or an image problem since everything works fine on any other computer. My best guess is aliens manipulating the space-time continuum.
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Mike Heintzman
Modeling the P&PU since 1953
Mike Heintzman