Hi,
Thank you for trying MyEclipse 2015 CI. Sorry that you are seeing issues.
1. Can you please try starting MyEclipse with -clean command line args then build the projects and see if the issue persists?
2. Also please check if importing the project to a new workspace helps.
3. You can also try increasing the memory settings (-Xmx) in the myeclipse.ini file (its found in the MyEclipse installation folder) and check if it helps.
4. If you are still seeing issues, please share the MyEclipse Installation Details from MyEclipse > Installation Summary > Installation details. Also share the contents of the myeclipse.ini file and the .log file (before sending us the .log file, delete the contents of the .log file, replicate the issue and then send it).