did you mean the paper profiles for the particular printer??
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Yes I did, sorry for being not very clear... I forgot the existence of "plain printer" (not media-specific) profiles.
The most puzzling thing is that this show/hide behaviour seems really erratic...
The first "missing profile" was one for a semigloss paper , and though I could use other profiles of paper of the same brand, with very similar canned profiles, made with the same equipment/target as far as i can tell in the file properties.
A few days later, I installed another canned profile of the same brand, the latter did not show but made the former (the semigloss one) appear...
The most rational explanation I found so far is that LR randomly sends some profiles in the twilight zone (uh, hasn't it been nicknamed "shadowland"?), but this particular twilight zone has a very limited real estate... No?