Nitsko,
Sorry that you are seeing this issue.
Can you please answer some more questions for us?
1. Are you opening the same MyEclipse 10 workspace in MyEclipse 2014? Is the MyEclipse 10 also installed on the Windows 8, 64 bit? Usually switching to 64 bit needs more memory.
2. How large is the workspace, in terms of number of projects and files in each project?
3. Can you please remove the duplicate entry -XX:ReservedCodeCacheSize from the myeclipse.ini file,change -Xms256m to -Xms512m and try increasing the -Xmx to a higher value and see if it fixes the issue?
4. If possible, can you please switch to a new workspace, create a dummy project and see if the issue persists ? If the issue cannot be replicated try importing the projects from the MyEclipse 10 workspace and check?
5. Please delete the contents of the .log file which is located at <workspace dir>/.metadata/.log. Now replicate the issue with the problematic workspace and attach the .log file to help us investigate further (change the .log to .txt to attach it).
Let us know how it works for you.