Trying too hard to win at everything. Failure builds character! Really! It does! There is no better way to develop your character than to fail. A lot. They will grow much better than a guy who never loses anything. I've been roleplaying for years, not necessairly on a forum but in real time in other games, and I see people try WAY too hard WAY too often just to win...that and giving your characters items with bulls**t abilities that give them unfair advantages because "It's a family relic" or something like that...
As said before, the Dissapearng Act. I had a friend on here whom I threaded with a lo. He left because his IC Master stopped getting on without a trace, so since he couldnt develop his character with his master like he wanted, he stopped coming on, too. It really sucks.
Also stated before, Too Much Tech. Write better, stop developing technology that makes your character a demigod in battle. Ffs....that isnt the point of forum roleplay. Developing technology, to me, is about creating cool, unique items for your character or to explain tech that certain faction's soldiers and armies use. I hate seeing a humungous influx of new tech before invasions and skirmishes.
... *exhales and wipes forhead*