The problem commenced 2 days ago after i downloaded the latest viewer. At 700m (the level of my main residence), the blue horizon appears drawn incorrectly. More specifically its has gaps in it which do move. Also a great degree of flickering is occasioned when those gaps are filled. Looking down there are more gaps and that area of blue one can see appears curved (picture attached). The location is Sapphire Island; 50, 240, 706. The problem seems very similar to that reported by Moon Matty 3rd May 2009 in respect of viewer 1.23 ref Key VWR-13198.
This problem virtually renders my main sl residence unusable.