We have just made a change to the image upload plugin we use on the forum. The new plugin changes the upload system from postimage.org to imgbb.com and it offers a nicer interface with the ability to drag-and-drop.
However, it still doesn't work perfectly with the Member Gallery function, so to post images to your gallery you still have to do a bit of cut-and-paste. Details about how to do this can be found here
We rely on a community of developers who write these plugins to extend the functionality of the ProBoards platform. They add a lot of great functionality, but we don't have much control of the changes. So the decision to switch to imgbb.com was made by the developer. The admins of this forum can only confirm that the plugin works - we cannot in anyway vouch for the imgbb.com service. As with any web-sharing services, you should consider what you are sharing and whether you want to include appropriate watermarking.
We hope you like the new functionality and please provide us your feedback!