JTree rendering failure : big empy space displayed

Hello,
I have a problem using a JTree with jdk 1.5 update 10. I could not find anything in the bug database that seemed to link to this problem.
I have created a JTree that displays the content of a directory under a root node (displayed). I have created my own renderer to customize the labels and i use a TreeModel to add and remove nodes.
The problem (possibly a known bug): sometimes (it actually seems to be completely random), the Ttree "fails" rendering one of the label, resulting in a big white space instead of the usual label (icon + file name). Other labels in the tree are displayed correctly. The "big white label" can be selected and correctly links to the file it represents (information about the file is displayed correctly). All in all, everything works perfectly fine except one item is displayed as a big empty label.
Is there any chance this could be a java bug ? If not is there any way i could know what causes this failure ?
Regards.
NB: some friend of mine that is working on a different project has exactly the same problem and can't find a solution either.

I am having the identical problem and its driving me crazy. This started happening to me after I installed new hard drives and reinstalled the OS. I then transfered all the old settings from the old drive. Everything else seems to work perfectly. If you get anywhere with this let me know.
Hy
My goal: To import some pictures into iMovie. Maby
add ken burns efects to them, add a bit of narration
and some music, edit everything and export.
The problem: Let say I use the following method: i
click Media tab, then i click photos, then i select
the photo, and in the Photo Settings click apply.
iMovie then imports the photo, puts it in the
timeline and then the dark red bar bellow apears (the
one that would means rendering). The problem is,
there is no light red getting over it (that would
indicate rendering in progress). It's the same if i
click and drag a photo into the clip browser (only
the dark red is displayed on the bottom of the
thumbnail). If i try to quit iMovie it warns me that
rendering is in progress.
It doesn't matter how big a photo is (i tried
300x200px, 800x500px, 1500x1000px, 3000x2000px) or
what format (jpg, tiff, png).
I tried restarting the application and the sistem. I
created another user to try if anything changes. I
erased the preferences. I even tried copying the
whole application from frend's computer (the same
version and all). The dark red bar doesn't start to
fill red (i checked in the terminal how much
processor does it eat and it's on 7%, so it probablly
means it's doing nothing)
I have a 2Ghz, 2GB of ram Macbook 13" Intel core duo.
I have 67 GB of space left (format: Mac-os extended -
journaled), running OS-X 10.4.8 and updated to the
latest updates. iMovie version is 6.0.3 (267.2).
What else is there to do? Would reinstalling the
whole sistem help and is there a way to keep all of
my preferences and mail accounts and contacts, … in
case i have to do that?
thx in advance
Peter
Macbook 13"
Mac OS X (10.4.8)

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