Black screen on start after update to OS X 10.10.3

Hello,
I updated my Mac Book Air to OS X 10.10.3 and now when I start it the screen is black and after several seconds I get the password screen.
My Mac Book Air is a mid-2013, FileVault is activated.
This behavior started after the update to 10.10.3, and FileVault was already activated.
Could you please give me some help to find a solution and have my Mac Book Air work normally as before?
Thank you all for your help.

Hello again,
I found a trick in order to get my Mac Book Air start normally.
Here it is:
1. I deactivated FileVault.
2. Once the FileVault deactivation process completely terminated, I switched off the Mac Book Air.
3. I restarted the Mac Book Air, it started normally.
4. I reactivated FileVault.
5. Once the FileVault reactivation process completely terminated, I switched off the Mac Book Air.
6. I restarted the Mac Book Air, it started normally with FileVault activated.
Well, I solved the issue by myself, but I think this should not have happened.
Maybe the problem is that the update process had not been set for a Mac Book Air with FileVault activated?
I hope someone from Apple will give me/us an explication for that issue, and it would be a good thing that this situation does not arise again for next OS updates.
Best regards.

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