I am having this problem (but never thought to look into the sky though) that whenever I log into my households in San Myshuno the stalls are poof and the vendors are standing there like....'what the fudge?!?!?!' But if I take my Sims traveling, has to be via the phone, to another lot in the same area OR even to another hood and back again, also via the phone, the stalls are back. If I do nothing the stalls will eventually re-spawn at night (at the hours when the stalls start a new rotation). I thought I was having problems with mods and I have been meaning to do a 50/50 checkup but as it doesn't really bother me or hinder game-play much I have been putting it on the back burner.
But I am glad I am not the only one. And yes, I will check the skies next time I play in San Myshuno.
Oh and the same thing goes for festivals. If I log out during festival time (and my Sims are living in festival area) the festival is gone next time I log out. I have to travel to another San Myshuno area and back again for the festival to reappear. And as it is festivals I dare not not bring them back as I am afraid festivals might glitch even more.
