Yepp... It's convenient to let a program remember your passwords with you only having to remember one that should be strong enough and then some. It's also convenient if the passwords are in the cloud, migrating to a new computer will be just that much faster. But... If it's man made, it's man hackable.
The only fool proof way to store passwords from hackers is a tiny book where you write them down and keep the book updated. Even that isn't 100% safe as the services you use can be hacked but if you use good password hygiene and never use the same in other services, only one service at a time is endangered.
Hope you're safe behind that long master password. Changing that might suffice but as you can't tell whether they've already figured that out it's safest to change them all.