I know it's suggested that you export your psd files to jpgs within LR, but for a particular reason I need to do it from PS. After doing a save as in LR and exiting using ctrl-w, I go to the directory in LR and do a synchronize folder. It shows that there is one file to be imported, but it doesn't show up when I try to import it. However, if I go to the directory in Window's explorer and change the name of the jpg, it shows up in LR and imports just fine. I can then rename the file back to the original name in LR.
This is something new, it used to work just fine.