I cannot start the Modeler version 3.1.0 on my local PC. I get an error that the JDK is not compatible. However, I do have JDK 1.6.0_18 installed and selected (I also have a 1.5 version installed, but that is not selected. See this image . Is there an issue with this version of the JDK, or is the startup check detecting the older JDK on my laptop, even though it is not selected in preferences?
Since version 3.1.0 the Mendix Runtime checks for a recent compatible JDK version to prevent known issues. Currently we check for JDK 1.6 update 22-29, although update 29 is not supported if connecting to an SQL Server database. From your screenshot, it seems that you currently use update 18. Installing a newer JDK version and configuring it in the preferences would thus solve your problem.
Benny van Reeven
This problem is not only a Mendix 3.x issue, but also for Mendix 2.x.