I installed the 2.3 beta inside a new eclipse neon (.3) as advised. When opening existing projects I only get a blue arrow on the screen, nothing else. Generating a new project seems to work fine...
Environment:
* Windows 10 (64 bit)
* Eclipse Neon .3 (64 bit)
* Connect IQ 2.3 beta SDK
To reproduce an example of an existing project http://starttorun.info/download.php?id=13
this is how it looks like: