I don't think that studying tsumego is at fault in these examples. If anything at all - It's the lack of studying and understanding. The 2nd example shows an attempt based on a guess instead of reading. While the 1st one not only shows lack of reading but also why tsumego are imperfect if you know there's a solution and requires less reading... Bottom line - If you really study tsumego it shouldn't hurt you. Bad habits that may result from tsumego study could be "too-local-a-vision" and such, but it's not really the tsumego study that is at fault here either but the lack of fuseki and midgame? study. Reuven