Remove the mod that added that block.
Also post the download to that world if this didnt fix it. Ill try to see what I can do.
LAN can be pretty glitchy. Try hosting a server on your computer. Because you want to play on LAM you do not need to worry about fort forwarding and all that.
Creating a server should be easy as the atlauncher gives you an option to install server. once your server is installed:
1) Run it
2) Agree to the EULA or the server wont start
3) Find your ipv4 by going to Run->And typing in "CMD". This will open up a command prompt. Here you type "IPconfig" and you should find your "IPV4" somewhere here.
4) You and the other guy connect using your IPV4
(Note: Instead of using the ipv4 you can also use "localhost" but I am not completely sure if it will work for both of yall)
Bukkit is for plugins. To install mods you need minecraft forge. You can go to http://files.minecraftforge.net/ and download an installer. In the installed you can click install server.
If you would like to have both plugins AND mods you can download Cauldron/Thermos/KCauldron/Sponge depending on what mods and what version you are using.
BTW I feel your pain of looking through sooo many tutorials. Let me know if you need more help.
So I sat down and did some old fashioned troubleshooting, playing with every setting I had access to I may have found a workaround!!
When you get to the first menu, immediately go to "Help & Options" and then "Change Skin". Select a different skin then what you currently have selected, it does not matter which one. You can switch back to the one you prefer immediately after selecting the other skin or just keep the new one. After that, push Circle to back out of the skin selector. You should see the Save animation in the upper right, let this finish. In my game, the arrow pokes the box 6 times before disappearing. Once the icon disappears, then you can go into "Play Game" and your worlds should show up fairly quickly and they should be accessible again!! Using this workflow I was able to load my Son's world successfully many times in a row, so I don't think this is coincidence. In fact, I have not had it lock up at all anymore once I change the skin every time I load the game.
I need some more people to test this, maybe I'm just lucky and/or crazy...If you are experiencing this issue please give this a try and let us know if it works for you or not, I sure would appreciate it as well as many others!!
Here is a long grumpy thread of people having similar issues:
There are more than a few people referencing the hard disk buffers/cache being overloaded. I also suspect this is the case and it makes perfect sense why this workaround works if true. Making the game access the disk for a small data call, like changing the skin, seems to prevent it from choking on the much larger data calls, like pulling in the World list. It is almost as if the small data call allows Minecraft to see how much space is actually available in a temporary cache location, before attempting to load the next chunks of data. Loading the World list directly causes Minecraft to attempt to load way more data then the cache is capable of holding, causing PS3 to lock up. This is just a theory of course, I'm no programmer.