Symbols disappear when printing

I haven't had a problem before but all of a sudden on a new map some (but not all) of the symbols that I've put in are disappearing when I try to print (to either of two printers). The symbols are disappearing from one layer (Furniture), but they disappear even if I put them into a different level. The symbols that survive are in the Symbol Definition Layer, but when I tried to put the other symbols into that layer they vanish again. Any suggestions as to what I'm doing wrong? Suggestions for fixing this?

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