Apple Photos thumbnails missing

The machine is running Yosemite and Photos.
The original database was created on Iphoto but since Photos upgrade most of my pictures are showing as a square.

I have tried to repair the database by holding command + option keys however I can't restore the images.

Can anyone advise please?

Rodrigo CarrilhoAsked:
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Backup of your iPhoto library before you try this:
Hold down  the option and command keys then at the same time double-click the iPhoto icon.
From the window that will pop up use the rebuild all thumbnails option.
Rodrigo CarrilhoAuthor Commented:
I am using PHOTOS not Iphoto. Your advice is for Iphoto.
"The original database was created on Iphoto"
"I am using PHOTOS not Iphoto. Your advice is for Iphoto."
The repair is similar, but the steps may differ...
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David AndersTechnician Commented:
iPhoto is supposed to be in your Applications folder, just the dock icon was removed and replaced with Photos.  Maybe try opening iPhoto with repair in mind?
This is supposed to be the ultimate guide to Photos
Rodrigo CarrilhoAuthor Commented:
I can not reopen Iphoto or download it again. The OS X is Yosemite, please advise otherwise.
David AndersTechnician Commented:
Photos appeared in OSX Yosemite update 10.10.3   if the update was applied to 10.10.2 - people have reported that iPhoto is still in the Applications Folder. Not true?
David AndersTechnician Commented:
Are you sure that your choice of setup in Photos deleted your iPhoto Library?
The process is illustrated here...
iPhoto may have been automatically moved to the trash, at least it did in mine.  If you haven't emptied your trash yet, look for it and put it back.
Rodrigo CarrilhoAuthor Commented:
iPhoto is not in the Trash. This was a fresh install of Yosemite.

I have copied iPhoto from an older backup copy of Application Folder, however it won't open on Yosemite.

Is there any third party software to fix the PHOTOS thumbnails problem?

Thanks for all comments.

Rodrigo CarrilhoAuthor Commented:
I have managed to solve this problem by browsing the backup folder and dragging it into Photos.

I ended up with 1 blank thumbnail + 1 correct thumbnail.

It was a long process to delete them, but the problem was resolved.

Thanks for all comments and apologies for late action.

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Rodrigo CarrilhoAuthor Commented:
I've requested that this question be closed as follows:

Accepted answer: 0 points for Rod_2012's comment #a40885705

for the following reason:

I have found the solution by myself.
If any experts comments helped, then awarding points will be respectful of you.
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