Lost Multicast Packets on 1 JVM Only

Hi,
I have a cluster of 4 JVM's which is distributed across 2 physical servers. This is running on a windows 32 bit environment.
Machine1: JVM01/JVM02
Machine2: JVM03/JVM04
JVM03 is losting lots of multicast packets, where the others are not. 1600 since 22:30 last night, so in about 12 hours.
I haven't noticed any side effects to the application of this happening, but I can't figure out why if JVM03 is losing them, I don't see them being lost on JVM04 as they are on the same physical hardware.
if it was plugged into a dodgy switch port, then I would expect both JVM's to be affected.
Anyone any ideas?
Pete

Are you running any add-ons that might change the appearance of the page, e.g., add-ons that block ads, Flash, scripts, etc.?
Sometimes you notice glitches in Firefox related to graphics card driver incompatibilities. To rule that out, you could disable hardware graphics acceleration. You usually need to restart Firefox in order for this to take effect, so save all work first (e.g., mail you are composing, online documents you're editing, etc.).
orange Firefox button ''or'' classic Tools menu > Options > Advanced
On the "General" mini-tab, uncheck the box for "Use hardware acceleration when available"
After restarting Firefox, do you notice any difference?

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Lost Multicast Packets on 1 JVM Only

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