Log into your cpanel on the server. Go to phpMyAdmin. Locate the database of your site. such as; smf_1 Now, locate EZPortal blocks, smf_ezp_block. Click it. Now on the right you should see a block of info. At the top are tabs, browser, structure, SQL etc, click browse, now all of the blocks are showing. Look at each and try to identify the last HTML block you created, and delete it. You will lose all information in that block so choose wisely. The blocks should have the name that you gave it, if you did. Outside of that I don't know what else to be done. When you remove the offending block, the forum should come back. Also, it might not matter which one you remove as long as one is. I think there is a limit to how many blocks, especially center blocks the software will support. But that is only my experience. There is another topic here dealing with this subject.