Could you please provide the name of that plugin so we know which plugin cause user registration conflict with wpForo?

Posted by: @brainland

I hope in your new updates, we can have easy upload of images into posts without passing through coding implementations.

Yes, we'll work on that in near future releases.

Thanks.. Resolved.... A plugin caused it.

I hope in your new updates, we can have easy upload of images into posts without passing through coding implementations.

This is affected by other plugin or the current theme. Please disable other plugin one by one and test to find the problem maker. This is not wpForo issue, this is affect of other plugins.