Howdy folks!
Sorry about that problem.
We have found the reason why the threads lock up when posting pictures.
If someone tries to attach a large picture.... large in image size, not in file size, one of the backend tools that handle resizing times out.
I have deleted the pictures causing the problem and the threads can be opened again.
Hopefully we can get that backend software to work properly asap.
Now, don't stop posting pictures, but make sure that the picture you upload is not big.
If you can, please upload pictures not bigger than 600 in width.