sony cybershot pictures missing
I'm having an issue that all pictures taken with my cybershot are missing in iphoto. I last uploaded from it in Aug or Sept and know that I've viewed the pics since then - maybe late Sept. Looking for them today, I am unable to find them. I also have a Nikon and those images are all showing up in iphoto. Based on other discussions here, I've rebuilt the library but am still unable to find them. Any suggestions will be most appreciated.
Thanks!
iMac, OS X Mountain Lion (10.8.3)