flood select and selection brush tool

[Snowcap1]

The above two tools are'nt working properly.  The flood select will after I make a selection say on the top of the photo will by itself move the selection to the bottom.  The Selection Brush tool simply sometimes just doesn't work.  On occassion while working on will get black screen that will come back but not show any kind of selection.  Don't know what to do.

[HVDB Photography]

 

In the toolbar, be sure  that to begin ....
for the Selection Brush Tool the Mode is set to Add
for the Flood Select Tool  the Mode is set to New

If you're on a (Image) layer right click on it and choose rasterize.