The scala command line interpreter hangs when given a script to preload. This still works in 2.9.0, but neither in 2.9.1 nor in scala-2.10.0.rdev-4161-2012-01-12-g5f5029d (i used the binaries from http://www.scala-lang.org/downloads), both using MainGenericRunner and the scala executable. The easiest steps to reproduce:

1. create a file containing: println("Hello World!"), save as script.scala
2. execute: scala -i script.scala leads to

marty@gamma:~$ scala-2.9.1.final/bin/scala -i script.scala
Loading script.scala...

and locks afterwards.

attaching jdb to my own code (basically a dispatcher for the MainGenericRunner which includes my own code in the jar such that it can be used interactively and which shows the same behaviour) gives the following stacktrace:

main[1] where 1
[1] sun.misc.Unsafe.park (native method)
[2] java.util.concurrent.locks.LockSupport.park (LockSupport.java:186)
[3] java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.await (AbstractQueuedSynchronizer.java:2,043)
[4] scala.tools.nsc.interpreter.ILoopInit$$anonfun$awaitInitialized$1.apply$mcV$sp (ILoopInit.scala:96)
[5] scala.tools.nsc.interpreter.ILoopInit$$anonfun$awaitInitialized$1.apply (ILoopInit.scala:96)
[6] scala.tools.nsc.interpreter.ILoopInit$$anonfun$awaitInitialized$1.apply (ILoopInit.scala:96)
[7] scala.tools.nsc.interpreter.ILoopInit$class.scala$tools$nsc$interpreter$ILoopInit$$withLock (ILoopInit.scala:70)
[8] scala.tools.nsc.interpreter.ILoopInit$class.awaitInitialized (ILoopInit.scala:96)
[9] scala.tools.nsc.interpreter.ILoop.awaitInitialized (ILoop.scala:34)
[10] scala.tools.nsc.interpreter.ILoop.processLine$1 (ILoop.scala:538)
[11] scala.tools.nsc.interpreter.ILoop.loop (ILoop.scala:550)
[12] scala.tools.nsc.interpreter.ILoop$$anonfun$interpretAllFrom$1.apply (ILoop.scala:563)
[13] scala.tools.nsc.interpreter.ILoop$$anonfun$interpretAllFrom$1.apply (ILoop.scala:560)
[14] scala.tools.nsc.io.Streamable$Chars$class.applyReader (Streamable.scala:99)
[15] scala.tools.nsc.io.File.applyReader (File.scala:76)
[16] scala.tools.nsc.interpreter.ILoop.interpretAllFrom (ILoop.scala:560)
[17] scala.tools.nsc.interpreter.ILoop$$anonfun$loadCommand$1.apply (ILoop.scala:604)
[18] scala.tools.nsc.interpreter.ILoop$$anonfun$loadCommand$1.apply (ILoop.scala:603)
[19] scala.tools.nsc.interpreter.ILoop.withFile (ILoop.scala:597)
[20] scala.tools.nsc.interpreter.ILoop.loadCommand (ILoop.scala:603)
[21] scala.tools.nsc.interpreter.ILoop$$anonfun$standardCommands$8.apply (ILoop.scala:222)
[22] scala.tools.nsc.interpreter.ILoop$$anonfun$standardCommands$8.apply (ILoop.scala:222)
[23] scala.tools.nsc.interpreter.LoopCommands$LineCmd.apply (LoopCommands.scala:80)
[24] scala.tools.nsc.interpreter.ILoop.command (ILoop.scala:646)
[25] scala.tools.nsc.interpreter.ILoop$$anonfun$loadFiles$1.apply (ILoop.scala:763)
[26] scala.tools.nsc.interpreter.ILoop$$anonfun$loadFiles$1.apply (ILoop.scala:761)
[27] scala.collection.LinearSeqOptimized$class.foreach (LinearSeqOptimized.scala:59)
[28] scala.collection.immutable.List.foreach (List.scala:45)
[29] scala.tools.nsc.interpreter.ILoop.loadFiles (ILoop.scala:761)
[30] scala.tools.nsc.interpreter.ILoop.process (ILoop.scala:802)
[31] scala.tools.nsc.MainGenericRunner.runTarget$1 (MainGenericRunner.scala:67)
[32] scala.tools.nsc.MainGenericRunner.process (MainGenericRunner.scala:80)
[33] scala.tools.nsc.MainGenericRunner$.main (MainGenericRunner.scala:89)
[34] at.logic.cli.CLIMain$.main (CLIMain.scala:50)
[35] at.logic.cli.CLIMain.main (null)

If it is of interest, i can provide the sources of CLIMain, but since the behaviour is the same if it does not contain my own code, this would only complicate matters.
Thanks for looking into the matter, I hope I can be of some help :)