David,
Sorry that you are seeing this issue.
1. Any changes made to the IDE or machine recently?
2. Any other third party plugins installed?
3. Do you have any anti virus/firewall running in the machine? If yes, then which one?
4. Can you please share with us the .log file located at workspace dir/.metadata/.log (rename the extension to .txt and attach it here) along with your OS and version details and Eclipse version details for further investigation?
Apologies for inconvenience caused.
–Swapna
Genuitec Support