You need to mess with the permissions. It can be quite complex, but if it is too much, you shouldn't be using bukkit.
If you can handle it, then you should install one of the great permission plugins. They will allow you to control everything you want your players to do.
I have been getting errors with magic launcher every update. Fixed by completely deleting the .minecraft directory (back up worlds/screenshots/texture packs first!), then running the normal MC launcher to re-download the game files. You should be able to add your mods again without it crashing. Worked for me, but I can't say if it will work for you.
I know this is an old topic, but I thought I should add that it worked for me on windows 8 GM. Thanks so much for this, I searched everywhere and this was the only one that worked!
Well, this may possibly be thread necro, I don't know but for anyone like me who was still working on this I have FINALLY found a solution for my laptop. The problem was that I was stupid and was trying to install desktop drivers on to a laptop. Anyway, here's what I did to fix it:
Download the ATI Mobility drivers from here. The normal ones will work for desktops, but for laptops you'll want these (which are hidden from view and hard to access unless you know the url).
Run the installer to extract the files but DO NOT install them.
Go to the Control Panel and open the Device Manager.
Click Display adapters and then right click your video card ('ATI Mobility Radeon HD 4200' for me) and click 'Update Driver Software...'
Click 'Browse My Computer For Driver Software', then 'Let me pick from a list of devices on my computer', then 'Have Disk', then 'Browse' and find the directory where the drivers are in the package you just extracted. For me this was 'C:\AMD\Support\12-4_mobility_vista_win7_64_dd_ccc\Packages\Drivers\Display\W76A_INF'
If it worked it should show your driver AND YOUR DRIVER ALONE in the display window. If there are a large array of drivers showen your one is probably not present among them.
Click next, wait while the drivers are installed (your screen will probably flicker a little or go black temporarily) and then click close. That's it!
Your graphics card in the display adaptor section of the device manager should no longer mention WDDM 1.1 or whatever it had before if it worked correctly. This fixed everything for me, please let me know if this helped you. Also, I didn't mention uninstalling any drivers because the default windows ones are built in and cannot be uninstalled.
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If you can handle it, then you should install one of the great permission plugins. They will allow you to control everything you want your players to do.
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This is not happening during vanilla minecraft play, just FTB. It also doesn't matter what pack, they all have the same problem.
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