I recently upgraded from PS CC 2015.5 to PS CC 2018, apparently successfully. But when I tried to open a JPG, make revisions and then SAVE AS a a different JPG (or any other format) I got the message "Could not save a copy of filename.jpg because the file could not be found". Same happened when trying to save as a TIFF, PNG or PSD. Only the EXPORT, SAVE FOR WEB allowed saving as a new JPG. After a couple of frustrating hours I uninstalled, then re-installed and got the same message.
I'm using Windows 7 Pro, with 32mg RAM.
Ironically, it works fine on my MacBook Pro. Needing to get some work done, I uninstalled the 2018 version and then installed PS CC 2017, which works fine. But I WOULD like to get the 2018 version working. Any help out there?
Using a Windows 10 Creators x64 system here with PS CC 2018. I'm trying to repro with any JPEG I have but cannot seem to do so. I open a JPEG > File > Save As > JPEG as file type and save elsewhere. Tried both original file names and new names. Works fine.
Have you tried the CC Cleaner yet?
(I should note: I recently reformatted my system and installed Photoshop fresh.)