Colour cast in picture highlights

[tommyboy]

All of my images viewed in Adobe Raw have developed a bright Red colour cast in the highlights of the picture ie,the sky etc.This is only present in the edeting pane of Adobe Raw,when viewed in the the viewing pane the picture looks perfect.I have found the only way I can aleviate this red cast is to use Lens correction and then Lens vignetting which makes the cast disappear I am then able to continue editing in raw or save the picture.
I have this week introduced an external hard drive to back up my pictures etc I dont think this the reason for my problem because I am editing my pictures on my internal drive.
Can someone advise me if there is possibly a reset button in Adobe Raw Converter which will take my system back to original preset position or do I have to Re-down load ACR again.
Please,Please any ideas.Thanks

 

[swanseamale47]

You probably have the clipping warning turned on, it's highlighting "blown" areas.
(little arrow in top corners of histogram) highlighted here by green circle.

 

[tommyboy]

Thanks such a LOT Wayne you have solved my problem and all is now well.I am so pleased and thankful.Still learning about RAW.

 

[swanseamale47]

Glad to be able to help Graham.