Controls on JPanel auto-enlarge at random

Hi there
I have developed a small swing application that consists of a JTabbedPane containing two tabs. each tab contains a JPanel on which a JToolbar, JSplitPane, and a small JPanel reside. on the JToolbar are a number of controls like JTextFields, JComboBoxes, JLabels, JSlider, etc. I did not use a layout manager for the controls on the JToolbar, but placed the components where i wanted them and at the size I wanted them. Each time I start up the application, i find that sometimes (once every 3 times I start up the app), one of the controls on the one or both tabs tend to size to to the size of the tabsheet. This happens at random and mainly happens in Linux and sometimes in Windows. Is it possible that somebody can help me figure out why this happens and how to solve it? If you need some source code, I'll be glad to send you some.
Please help
Thanks
~Glen

I used setSize() and setLocation() methods to set the size and location of the components. I could of used setBounds, but I needed to use the two seporate methods. I use setPreferredSize() too. It is as if the java vm gets confused and decides to resize a component to the application window. Remember this happens at random. sometimes the app looks correct and sometimes it doesn't.

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