@WiGgLr, which *.fir file are you using? Are you updating the firmware to install ML with a lens attached or not? I cant see how the card you use could cause the shutter bug.
I took the ML files from this post:
http://www.magiclantern.fm/forum/index.php?topic=3648.msg68248#msg68248as advised by funkysound, who also didn't have the shutter bug. Looks like there is a .fir file in there, my bad. I just checked and that is still on the 64GB card.
I had nothing attached to the camera at all, no lens, no speedlite, nothing. I followed this guide from here ad assumed a lens is an accessory
http://www.magiclantern.fm/install.htmlStep 1. Preparing your camera
Use a fully charged Canon battery (original, not third party);
-Remove any accessories from your camera (such as battery grip or external flash);
-For first install, use a simple SD/SDHC/CF card (32 GB or smaller). 64GB cards and larger will not work for first install (but you can use them with ML, see below).
-Make sure you have a card reader.
-Double-check your Canon firmware version.
-Rotate your mode dial to Manual (M) position.
-Recommended: Restore your camera to default settings (Clear settings, see picture above). Remember this will reset all canon settings and removes custom picture styles!
Step 2. Installation
Format the card in the camera (low-level format).
Unzip all of the files from Magic Lantern zip archive to the root of your card.
Launch the Firmware Update process.
If the card LED is blinking for more than a few seconds, upgrade your Canon firmware from the links above (even if you already have the correct firmware version number!) and try again.
Once you see the green confirmation screen, restart your camera. Done.
Once I'd done that with my smaller card, I followed the instructions to put ML on my 64GB card using EOSCard linked in the same set of instructions:
Installing Magic Lantern on other cards
If you use SD/SDHC/CF cards, you may simply repeat Step 2 on every card you would like to use Magic Lantern.
If you use SDXC cards, or if you prefer to skip the firmware update step and prepare all your cards from the PC, you may copy ML files on your card and make it bootable with a special utility: EOScard for Windows

I have put nothing else on the card at all.