The MPLAB-X IDE is based on NetBeans, which is in turn based on=20 Java/JVM. My guess here is that the problem lays in how the JVM=20 interfaces with OS/X. There are issues with Trilogi, the IDE for the TRI-PLC PLC's (Industrial=20 control computer) that uses Java. It requires an ancient version=20 (1.14...), and then running a little program to modify that.=20 Reinstalling anything in the area can cause issues. Is it possible that MPLAB-X requires some particular versions of something? --=20 http://www.piclist.com/techref/piclist PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist .