I looked it up . A security token is a physical device, such as a key card to unlock a door. It is used along with or instead of a password.
Sometimes, it is plugged into a USB port. Obviously, this is not the issue for me. Is there anyone there besides you who can help?

No, in this case it is a digital confirmation, but we are working on it.

So, it's not a security token? Could you let me know when the problem is resolved, please?

This image is supposed to post direct to the page without attachment as 640 X 380 and appears as such in the preview, but then it reverts to thumbnail size when posted.

IBJoel
Earlier this afternoon, I managed to upload an image on another thread. It would seem the problem is on my side as my connection looked pretty solid at the time. Now, not so much. I guess I need a different I.P. Sorry for all the fuss. I'll keep trying, though. The guys keep asking to see more of my stuff. Thank you for all your help.

Any chance we get a good answer some day,,,, the black screen problem persists,,, only here

Still getting a black screen when clicking or tapping a photo in a post.

Also, getting a security token error if trying to upload 4 or more photos from an iPhone 7 on iOS 11.2. If photos are modified or cropped from the original, there is an upload error also. Taking a screenshot of said modified photo and uploading that will work at the expense of image quality.

The attached image is from a 4-image upload. Dropping to 3 images in one shot worked fine. Clicking on hose images in that post showed a black screen after posting. Had to enlarge and download image to see it.