When trying to use the Check Email button in cPanel, you may get stuck on this screen:

Other accounts appear to log in okay.
This can occur if the Roundcube database for the user becomes corrupted.
RoundCube data is stored in the following folder, where $domain is the domain that contains the email address you are working with:
/etc/$domain/
To restore to a previous version, either from the automatic copies made or from a backup, do the following:
- Login to cPanel
- Open the File Manager:

- Navigate to the /etc folder and then the domain
- Look for a file that starts with the name in your email address and ends in rcube.db
For example, if your email address is support@uptimewebhosting.com.au, look for the file:
/etc/uptimewebhosting.com.au/support.rcube.db
- Rename this file by adding an extension such as .bak
For example:
support.rcube.db.bak - Now try logging into WebMail again.
This should create a new RoundCube database and restore your access to your webmail.