Why does Gyazo sometimes open IE even when I have set Chrome as the default browser?

Please check if the HTTP and HTTPS protocols are associated with Chrome by default on your computer.

You can check it and change it if necessary by following these steps:

Windows 7

1. Click Start > Default Programs > Associate a file type or protocol with a program.
2. Click "HTTP" and "HTTPS", then click Change program.
3. Click Google Chrome or other web browser that you want to use.
   
4. Click OK.

Windows 8.1

1. Click Control Panel > Default Programs > Associate a file type or protocol with a program.
2. Click "HTTP" and "HTTPS", then click Change program.
3. Click Google Chrome or other web browser that you want to use.
   
4. Click OK.

Windows 10

1. Click Start >Settings > System > Default apps > Choose default apps by protocol.
2. On the right of "HTTP" and "HTTPS", choose Google Chrome or other web browser that you want to use to be shown.