Constuctor nice but seems buggy "Not responding

I still prefer constructor to other tools, but it seems to have a problem running on my system (oh, that's an idea.. maybe try it on another for work! but anyway:..)

I have a dual-core WinXP pro system with an NVIDIA 8500GT. The problem I am getting is that the program seems to really hate losing focus. Whenever it loses focus (alt-tab, other monitor etc) it seems to go into not-responding for a long time and tho it usually comes back it's rather inconvenient.

It makes the program next to unusable in a single-monitor environment, so I tried with dual-monitors and it still occurs tho it makes it a little easier to wrangle.