Last week I downloaded version 0.7.0. It performed very well and I was seeing the equatorial and azimuthal grids at last. But with the new 0.7.1 version the grids have disappeared again ? I see only the numbers very faint but no lines.
Is it my computer ?
You seem to have CSS turned off.
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It is probably not your computer. Mine behaves likewise.
For me, the grids have already vanished since 0.6.1; the second build of 0.6.0 (but not the first one) still worked. Your messages should better fit into the "bugs" forum, cf. bug-ids 1290787, 1215476, 1055956.