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If there is >1 module loaded from the classpath, an IllegalArgumentException can result from module code (because it is trying to add the startup classloader more than once to the module classloader). Observed with core as the first "module" in classpath, and also an old (actually quite bogus) core patch (which illegally had module tags in it), as reported on nbusers I think. Should not affect normal configurations of the IDE.
Fixed in trunk and release32.
*** Issue 10369 has been marked as a duplicate of this issue. ***
*** Issue 10414 has been marked as a duplicate of this issue. ***
Target milestone 3.2
Resolved for 3.4.x or earlier, no new info since then -> verified.
Resolved for 3.4.x or earlier, no new info since then -> closing.