Screen fails to redraw (sheets overlapping) after executing a macro, errHandler problem?

Hi friends,

I am almost there with my tool but it's not working properly. After I play the following macro the screen doesn't refresh properly when I change a cell. Just imagine that some parts of different sheets are showed overlapped in the active sheet.

If I scroll down everything get back to normality until I again need to change a cell.

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I am pretty sure there is an error in the execution because when line "On Error GoTo errHandler" was working before I commented but I don't know what it means or how to take advantage of it.

Hope you can help me. It's the final issue I need to solve out.

Many thanks. All the best,
Geronimo

ps: this is a split up of this post because it became too large to follow http://www.excelforum.com/excel-prog...ns-manual.html