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I have a computation running, where I use all my available kernels using ParallelDo. However, if I check the kernels status under Evaluation -> Parallel Kernel Status, I only find the information "4 kernels running, busy" and a yellow plus-icon in the upper-right corner, which usually indicates a syntax error (type e.g. "1+" in a Notebook session). Clicking the icon, the message

An unknown box name (FEPrivate`FrontEndResource["FEExpressions", "UnevaluatedDynamicBox"]) was sent as the BoxForm for the expression. Check the format rules for the expression.

is displayed. If there is no evaluation running, all kernel properties are displayed nicely.

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On Windows I see similar behaviour when trying a simple, abortable ParallelDo[Pause[1], {100}]. The parallel monitoring tools window will update only when an evaluation is not ongoing. – Szabolcs Jun 1 '12 at 9:05
I see the same behavior on 32 bit Windows XP. – Alexey Popkov Jun 1 '12 at 9:09
@Alexey This is consistent with my observations. When I open the parallel monitoring tools, the content of the window freezes after starting the computation. – Frederik Ziebell Jun 1 '12 at 11:04
With Linux AMD64, I also get the message as posted in the question. – Fred Kline Jun 1 '12 at 11:40
I do wonder if this an actual bug or just a technical limitation. The message and the yellow cross are ugly though. Did you contact technical support about this? If you do, and get a reply from them, please come back and post it as an answer for everyone's benefit. – Szabolcs Jun 1 '12 at 11:41
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