Minos28,
Sorry that you are seeing this issue. There might be an issue with populating the indexes due to network problem.
1. Can you please copy paste the Installation Details from MyEclipse > Installation Summary > Installation Details?
2. Clear the contents of the .log file which is located at <workspace dir>/.metadata/.log. In the Add Dependency window, click on ‘Refresh indexes’ and try searching. Please check if there are any errors logged in the .log file. If yes then please copy paste the entire contents of the .log file here for us to investigate further.
3. Also share the details of the Maven dependency you are trying to search for to help us replicate the issue at our end.
Let us know how it works for you.