# Strange Underfull \vbox problem [closed]

This is the code:

\left. \begin{aligned} K_1 \cos{\theta^{(1)}_4} - K_2 \cos{\theta^{(1)}_2} + K_3 & = \cos(\theta^{(1)}_4 - \theta^{(1)}_2) \\ K_1 \cos{\theta^{(2)}_4} - K_2 \cos{\theta^{(2)}_2} + K_3 & = \cos(\theta^{(2)}_4 - \theta^{(2)}_2) \\ K_1 \cos{\theta^{(3)}_4} - K_2 \cos{\theta^{(3)}_2} + K_3 & = \cos(\theta^{(3)}_4 - \theta^{(3)}_2) \end{aligned} \right\}


It shows me:

Underfull \vbox (badness 10000) has occurred while \output is active []


But if I comment any equation line, so there are 2 of the 3, any message is shown.

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## closed as too localized by egreg, lockstep, Joseph Wright♦Nov 22 '11 at 18:59

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I don't get any warning with this code. Please add a minimal working example (MWE) that illustrates your problem. – Andrey Vihrov Nov 18 '11 at 12:24
This warning is only indirectly tied with that alignment: it tells you that the page break (probably caused by the alignment itself) has produced a bad page. – egreg Nov 18 '11 at 14:29