Photoshop CS2

[Sgt_Pepper]

Hi, I'm quiet new to Photoshop. When i opened it this morning and tried using the pen tool everything inside the pen tool selected area goes black, any idea what setting will change this back to normal.

 

[P_A_N_I_C]

see the circled buttons

 

[Sgt_Pepper]

Much appreciated, it's been driving me mental.