Export Frame misses out some image details

Since the latest update, the export frame button no longer works properly. Previously it exported a jpeg of the whole frame, but now it omits text from some layers. See image 1 and image 2 below.

The first image shows what should be exported - but is a screen grab of the frame. The 2nd image shows what the export frame option produces (note the missing text).

Third image is a full screen grab

Any help / advice gratefully received!