Hi,
Yes, this looks related. Something is buggy with the program for it to behave this way. Importing many times 706 games and getting a few missing each time, or me importing 1-2 games and it saying 0. I only experienced this after upgrading to 11.15, so I figured since that is all that changed, that must be the problem -but its not as you are using earlier versions with similar import issues.
As mentioned, if I do exactly the same process as the video I provided earlier, with PSP game "50 cent bullet proof", it works fine, delete the game, then import it -just fine. Do that with Genesis game Hercules -0 files to import, do that with Virtua cop 1 or 2 in MAME, 0 files to import.
After seeing your video, I did a quick check on my own setup to see if it imported everything.
PSP rom files 120, launchbox database 119 (Imported the missing game manually 120/120)
SNES rom files 788 launchbox database 730 (I see around 15 filename duplicates in the folder, I'll clean this up -still it missed a lot) (This is going to be the same as my genesis console below)
PS2 rom files 73 launchbox database 73
Sega Genesis (Edit in BOLD/Italic) 906 launchbox 867 (Deleted all duplicates 25 in total, just a quick look at the folder, 100% there are not 75 duplicates, although this folder is messy and needs to be cleaned up) I have gone through alphabetically up to end of F and found 11 games not imported which did import manually. So there is a discrepancy of 39 down from 75, the missing games I will import manually and get it to be 906 / 906. Thanks wallmachine for your links. We can say confidently that the program does not import 100% perfectly every time, in my genesis console it missed 50 of 906 which is an error rate of 5.52%
My PS1 folder is also different to the imported launchbox database. Fixed this, imported 1 game manually, now is 81/81
The rest of my consoles, handhelds & arcade systems are probably the same -some missing games.
Ill do a thorough look through my whole setup at some stage -that is going to take some time.