Layers disappearing randomly

i'm having entire layer group disappear @ random.  still there in layers panel, it's not being displayed on stage.  had added new subfolder group, , believe culprit.  removing subfolder stops problem happening.  here steps cause issue:

 

1. my layer group ("a") showing.
2. i start editing layer (text field, font)
3. the "a" layer group disappears.
4. i select "a" layer group , move tool.
5. when move "a", shows up.  can select "undo" have go (and stay visible).
6. if try edit textfield again, "a" group disappears once more.

 

if remove specific subfolder group "a," stops problem happening.  did have vector layers in subfolder, had moved them out.

 

has else had happen?  have never seen issue before.  wondering if it's memory issue, since i'm using large font files (fonts lots of detail).  file corrupt?  tried saving file.

 

i using photoshop cs4 extended v. 11.0.2 on windows 7 64-bit.

 

thanks.

 

brad

More discussions in Photoshop Windows (read only)

adobe