So here it is - i've been using a "scientific method" :-) to exclude all the other possibilities: I have
1) created a simple application using just one form with a TextBox, a Label and a Button -
It worked fine on another computer
2) created a simple application wich includes the UserControl in question -
worked fine on mine, but it crahed on another computer
3) created a simple application using a simple User Control (I've got the source - it does't do anything complicated) -
worked fine on mine, and on the other computer.
Now we can say that the User Control in question is responsible for my hedache. But what could explain, that it works flawless on my computer but not on another?
Is there a way I can bypass this error?