My bigest problem would have to be my appaling short-term memory. I am awful with remembering to use NPC's or PCs 'passive' powers or to just take account of particular effects.
Example: I placed a box containing a scarab of Death inside an anti-magic area (this is a horror-esque game) and the moment someone picked it out of the box I began describing its effects. Then, just as I was getting to the boring into flesh bit, the player piped in to remind me he was still in the anti-magic zone. Trap stupidly given away due to my forgetfullness. In the same game a player has a ring which is supposed to grow warm every time he is in danger -- I have yet (after five danger-filled sessions) to remember to alert him beforehand.
Yours,
Altin
Example: I placed a box containing a scarab of Death inside an anti-magic area (this is a horror-esque game) and the moment someone picked it out of the box I began describing its effects. Then, just as I was getting to the boring into flesh bit, the player piped in to remind me he was still in the anti-magic zone. Trap stupidly given away due to my forgetfullness. In the same game a player has a ring which is supposed to grow warm every time he is in danger -- I have yet (after five danger-filled sessions) to remember to alert him beforehand.
Yours,
Altin