"+" symbol to display attachments has disappeared after deleting some stuff from trash

OK, some background so you can hopefully duplicate this.
Zotero 1.5rsync3.8
I downloaded some references and pdf's from JSTOR. Because I don't like just seeing either JSTORfile and don't like them showing up as snapshots I've got into the habit of showing-fie and then dragging the pdf which has saved with the author-date-name onto the reference and then deleting the snapshot.
So today I deleted everything from my trash and then went back to the saved author search where these new references were.
The references which had had their snapshot deleted now don't have the "=" symbol next to them - at first I just thought that the pdf's had been deleted (cue much swearing) but then when I hit "+" on the keyboard, there they are, viewable, showable, it's just the + symbol has gone.
Very odd.
If I drag some random file onto the reference, the plus symbol reappears. I can then delete the inappropriate file and the symbol remains.
However (just discovered) if I now empty the trash again, the problem recurs.

Regards,
jon.

OK, so installed the trunk xpi 4069 just to see and the problem has gone. Don't know if this was just restarting Firefox, or reinstalling Zotero but problem gone.

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