Plant Symbols dissapear from 'Edit Plant Definition' and on render

[James Dawson Design]

I am having trouble with 3D plant symbols becoming invisible.

I set up a plant to use in a 3D render and more often that not when I render the perspective the plant does not appear.

Going straight into the Edit Plant Definition dialog shows the symbol as blank (as well as numerous others when I expand the 3D Symbol selection box).

This has been occurring for a while now and I have spent some time trying to work out why, but to no avail (it all seems very random).

The symbol(s) eventually come back and I dont know why.

- The problem does not distinguish between image props and symbols.

- The symbols appear and dissapear randomly within a single session.

- They seem to all return if I close down VW and reopen, then after a short while it starts up again.

FYI, I am running VW 12.5.2(71041) on a MacBookPro. I can also report that this was occurring on my old 17" Powerbook.

I am still productive with producing working drawings, but my presentations are dictated by rolling a dice, i.e. playing with the symbols until I get a perspective with some plant symbols on it.