Medicus

I found the solution in internet: Go to Control Panel Find "Mouse Properties" Go to "Pointer Options" Put a check mark in the "Display Pointer trails" Slide the bar over to "short" Apply the changes and then restart paint.net see: http://forum.tabletpcreview.com/microsoft-windows-7-forum/27626-scramble-cursor-portrait-mode-solution-2.html Cursor is now normal (a small cross).

Thanks for answer. Card driver update (Catalyst 12.1 from 1/25/2012) is done. - E.g. PS7, PSE9, Corel Paint3, Inkscape, Artrage and other non-graphic progs DON´T show this phenomenon. Its only Paint.net. See video (cursor.wmv, 4.2 MB) http://www.virds.de/cursor.wmv

When using the display in vertical (portrait) position, the cursor collapses in the edit area (not the menue area) to a black square (about 50x50px). Paintnet v 3.5.10.4297.28964. - Graphiccard ATI Radeon x1350 in a notebook 2x1,6 GHz under Win 7 / 32. Display position: Thanks Medicus