This bug has been fixed in Release 14 Service Pack 3 (R14SP3). For previous product releases, read below for any possible workarounds:
There is a bug in MATLAB 7.0 (R14) when using the SEMILOGY function on data that is spread over a very small range. To work around this issue, you can create a blank figure, use the HOLD ON function, and then use the SEMILOGY function. For example:
z=[5.725868264305767e-06 5.725868264305767e-06 5.725868264527811e-06 5.725868264749856e-06 5.725868264749856e-06 5.725868263861678e-06];
zz=z';
figure
hold on;
semilogy(zz);
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