Shapes Created In Draw Disappear / Vanish After Copy Into Writer Frame

Everything appears to work fine during editing and save of a Writer document. But on reloading (File > Reload), several shapes used in diagram frames have ‘disappeared’. After some experimentation I’ve established:
(Using LO in Win7)

  1. DRAW shapes all appear ok when first copied into a WRITER frame.

  2. Certain DRAW shapes (circle, rectangle etc) are missing from the frame after re-loading the WRITER document. Note DRAW lines and text boxes are unaffected.

  3. Using “Arrange > Bring To Front” has no affect.

  4. A single DRAW shape e.g. circle copied to a frame OR to page, PERMANENTLY disappears after reload.

  5. Two or more shapes copied over (as a group) do re-appear after reload but are ALWAYS behind any frame area fill, hence only visible if transparency >~10%

Anyone else experienced this issue?