What is the dos log telling you? Does it look similar to this?

Feb 1, 2004 8:19:03 PM trio.player.TRioPlayerFrame modeChanged
WARNING: Unexpected Exception while entering playback mode
trio.player.TRioPlayerServerException: Error connecting to JReceiver Server.
Please check that JReceiver is running and properly configured.
at trio.player.TRioPlayerJRecServer.connect(Unknown Source)
at trio.player.TRioPlayerJRecServer.listArtists(Unknown Source)
at trio.player.TRioPlayerTreeSelection.populateChildren(Unknown Source)
at trio.player.TRioPlayerTreeSelection.hasChildren(Unknown Source)
at trio.player.TRioPlayerJukeboxSequencer.setCurrentSelection(Unknown So
urce)
at trio.player.TRioPlayerJukeboxSequencer.<init>(Unknown Source)
at trio.player.TRioPlayerJukeboxDlg.<init>(Unknown Source)
at trio.player.TRioPlayerJukeboxMode.enterMode(Unknown Source)
at trio.player.TRioPlayerFrame.modeChanged(Unknown Source)
at trio.player.TRioPlayerUnitSettings.setMode(Unknown Source)
at trio.player.TRioPlayerModeDlg.entrySelected(Unknown Source)
at trio.player.TRioPlayerModeDlg$1.actionPerformed(Unknown Source)
at trio.gui.TRioList.fireActionEvent(Unknown Source)
at trio.gui.TRioList.processComponentKeyEvent(Unknown Source)
at javax.swing.JComponent.processKeyEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)
at trio.gui.TRioKeyboardFocusManager.dispatchKeyEvent(Unknown Source)
at trio.gui.TRioKeyboardFocusManager.dispatchKeyEvent(Unknown Source)

I know you said that your password is correct but this is what I get when I change the password to the wrong one within jrec.

Open Jrec and goto 'Configuration', 'users', select the 'trio' user id that you should have set up, click on the edit first selected button, make sure the role is set to 'players' and enter your password that matches what is set up in trio.xml twice. Make sure it is long enough or jrec will not accept it. After you've done that shut down the trio server and restart it.

Also, something to note is that I've got jrec, arm and trio thrown in the startup folder so they come on pretty much simultaneously and I have no problems.

Good Luck!

Sorry if you've done this already but it's the only thing that I can think of.