Yesterday was working ok but noticed that wasn't syncing to iCloud. So this what I did:

1. Few clicks on sync button and nothing happens.
2. Remove sync setting.
3. Activate sync with iCloud.
4. iCloud ask for permission. Granted. 
5. Empass crashes  

After this, every time that I open Empass:

1. Click on Empass.
2. Ask for permission (use touchID). Granted.
3. Empass crashes again  

I removed:

• Enpass app
• Empass folders & files in Library.
• Remove iCloud permissions to Enpass,
• Clean trash

Finnaly rebooted Mac. Double checked that all previously removed files were really deleted. Rebooted Mac again.

Then:

• Install Enpass from App Store. 
• Open Enpass
• Synced with iCloud. All my passwords were there
• BUT: iCloud icon keeps "syncing" and vault settings window says "synchronizing..." 

iCloud sync is broken.

Maybe I have to change to sync with Dropbox or other option.

The first sync especially takes a while, even after it looks like it is done. How long did you wait and how many entries do you have in the vault? More than 1,000?