Tile Vertical

I used tile vertical option (equivalent of an spanish version) in order to work with three files but I decide to maximize the screen so I decided to click the rectangle in the upper corner and after that pspad disappear.

I closed and open it again but even when pspad opens correctly I'm not able to use it because it seems that it goes to the upper left and I'm not able to restore it or make dispaly correctly.

Please help me because I'm totally lost with this problem.

If you have any suggestion or advice, feel free to post it.

Version 4..3 (2298) with Windows XP in a laptop.

TIA for your help.

Raul.